test: update cases to silence 'var is never mutated' errors

test/cases/adding_numbers_at_runtime_and_comptime.2.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var x: usize = 3;
+    _ = &x;
     const y = add(1, 2, x);
     if (y - 6 != 0) unreachable;
 }

test/cases/array_in_anon_struct.zig

@@ -2,6 +2,7 @@ const std = @import("std");
 
 noinline fn outer() u32 {
     var a: u32 = 42;
+    _ = &a;
     return inner(.{
         .unused = a,
         .value = [1]u32{0},

test/cases/assert_function.17.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: u64 = 0xFFEEDDCCBBAA9988;
+    _ = &i;
     assert(i == 0xFFEEDDCCBBAA9988);
 }
 

test/cases/bad_inferred_variable_type.zig

@@ -1,6 +1,6 @@
 pub fn main() void {
     var x = null;
-    _ = x;
+    _ = &x;
 }
 
 // error

test/cases/binary_operands.1.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: i32 = 2147483647;
+    _ = &i;
     if (i +% 1 != -2147483648) unreachable;
     return;
 }

test/cases/binary_operands.10.zig

@@ -2,6 +2,7 @@ pub fn main() void {
     var i: u32 = 5;
     i *= 7;
     var result: u32 = foo(i, 10);
+    _ = &result;
     if (result != 350) unreachable;
     return;
 }

test/cases/binary_operands.11.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: i32 = 2147483647;
+    _ = &i;
     const result = i *% 2;
     if (result != -2) unreachable;
     return;

test/cases/binary_operands.12.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: u3 = 3;
+    _ = &i;
     if (i *% 3 != 1) unreachable;
     return;
 }

test/cases/binary_operands.13.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: i4 = 3;
+    _ = &i;
     if (i *% 3 != -7) unreachable;
     return;
 }

test/cases/binary_operands.14.zig

@@ -1,7 +1,7 @@
 pub fn main() void {
     var i: u32 = 352;
     i /= 7; // i = 50
-    var result: u32 = foo(i, 7);
+    const result: u32 = foo(i, 7);
     if (result != 7) unreachable;
     return;
 }

test/cases/binary_operands.2.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: i4 = 7;
+    _ = &i;
     if (i +% 1 != -8) unreachable;
     return;
 }

test/cases/binary_operands.3.zig

@@ -1,5 +1,6 @@
 pub fn main() u8 {
     var i: u8 = 255;
+    _ = &i;
     return i +% 1;
 }
 

test/cases/binary_operands.4.zig

@@ -1,7 +1,7 @@
 pub fn main() u8 {
     var i: u8 = 5;
     i += 20;
-    var result: u8 = foo(i, 10);
+    const result: u8 = foo(i, 10);
     return result - 35;
 }
 fn foo(x: u8, y: u8) u8 {

test/cases/binary_operands.6.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: i32 = -2147483648;
+    _ = &i;
     if (i -% 1 != 2147483647) unreachable;
     return;
 }

test/cases/binary_operands.7.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: i7 = -64;
+    _ = &i;
     if (i -% 1 != 63) unreachable;
     return;
 }

test/cases/binary_operands.8.zig

@@ -1,5 +1,6 @@
 pub fn main() void {
     var i: u4 = 0;
+    _ = &i;
     if (i -% 1 != 15) unreachable;
 }
 

test/cases/binary_operands.9.zig

@@ -2,6 +2,7 @@ pub fn main() u8 {
     var i: u8 = 5;
     i -= 3;
     var result: u8 = foo(i, 10);
+    _ = &result;
     return result - 8;
 }
 fn foo(x: u8, y: u8) u8 {

test/cases/comparison_of_non-tagged_union_and_enum_literal.zig

@@ -2,7 +2,8 @@ export fn entry() void {
     const U = union { A: u32, B: u64 };
     var u = U{ .A = 42 };
     var ok = u == .A;
-    _ = ok;
+    _ = &u;
+    _ = &ok;
 }
 
 // error

test/cases/compile_errors/AstGen_comptime_known_struct_is_resolved_before_error.zig

@@ -6,7 +6,7 @@ const S2 = struct {
 };
 pub export fn entry() void {
     var s: S1 = undefined;
-    _ = s;
+    _ = &s;
 }
 
 // error

test/cases/compile_errors/C_pointer_pointing_to_non_C_ABI_compatible_type_or_has_align_attr.zig

@@ -1,7 +1,7 @@
 const Foo = struct { a: u32 };
 export fn a() void {
     const T = [*c]Foo;
-    var t: T = undefined;
+    const t: T = undefined;
     _ = t;
 }
 

test/cases/compile_errors/C_pointer_to_anyopaque.zig

@@ -1,7 +1,7 @@
 export fn a() void {
     var x: *anyopaque = undefined;
     var y: [*c]anyopaque = x;
-    _ = y;
+    _ = .{ &x, &y };
 }
 
 // error

test/cases/compile_errors/accessing_runtime_parameter_from_outer_function.zig

@@ -7,8 +7,8 @@ fn outer(y: u32) *const fn (u32) u32 {
     return st.get;
 }
 export fn entry() void {
-    var func = outer(10);
+    const func = outer(10);
-    var x = func(3);
+    const x = func(3);
     _ = x;
 }
 

test/cases/compile_errors/add_on_undefined_value.zig

@@ -1,5 +1,5 @@
 comptime {
-    var a: i64 = undefined;
+    const a: i64 = undefined;
     _ = a + a;
 }
 

test/cases/compile_errors/alignment_of_enum_field_specified.zig

@@ -6,7 +6,7 @@ const Number = enum {
 // zig fmt: on
 
 export fn entry1() void {
-    var x: Number = undefined;
+    const x: Number = undefined;
     _ = x;
 }
 

test/cases/compile_errors/ambiguous_coercion_of_division_operands.zig

@@ -1,17 +1,17 @@
 export fn entry1() void {
-    var f: f32 = 54.0 / 5;
+    const f: f32 = 54.0 / 5;
     _ = f;
 }
 export fn entry2() void {
-    var f: f32 = 54 / 5.0;
+    const f: f32 = 54 / 5.0;
     _ = f;
 }
 export fn entry3() void {
-    var f: f32 = 55.0 / 5;
+    const f: f32 = 55.0 / 5;
     _ = f;
 }
 export fn entry4() void {
-    var f: f32 = 55 / 5.0;
+    const f: f32 = 55 / 5.0;
     _ = f;
 }
 
@@ -19,5 +19,5 @@ export fn entry4() void {
 // backend=stage2
 // target=native
 //
-// :2:23: error: ambiguous coercion of division operands 'comptime_float' and 'comptime_int'; non-zero remainder '4'
+// :2:25: error: ambiguous coercion of division operands 'comptime_float' and 'comptime_int'; non-zero remainder '4'
-// :6:21: error: ambiguous coercion of division operands 'comptime_int' and 'comptime_float'; non-zero remainder '4'
+// :6:23: error: ambiguous coercion of division operands 'comptime_int' and 'comptime_float'; non-zero remainder '4'

test/cases/compile_errors/and_on_undefined_value.zig

@@ -1,5 +1,6 @@
 comptime {
     var a: bool = undefined;
+    _ = &a;
     _ = a and a;
 }
 
@@ -7,4 +8,4 @@ comptime {
 // backend=stage2
 // target=native
 //
-// :3:9: error: use of undefined value here causes undefined behavior
+// :4:9: error: use of undefined value here causes undefined behavior

test/cases/compile_errors/array_access_of_non_array.zig

@@ -3,7 +3,7 @@ export fn f() void {
     bad[0] = bad[0];
 }
 export fn g() void {
-    var bad: bool = undefined;
+    const bad: bool = undefined;
     _ = bad[0];
 }
 

test/cases/compile_errors/array_access_of_type.zig

@@ -1,6 +1,6 @@
 export fn foo() void {
     var b: u8[40] = undefined;
-    _ = b;
+    _ = &b;
 }
 
 // error

test/cases/compile_errors/array_access_with_non_integer_index.zig

@@ -2,11 +2,13 @@ export fn f() void {
     var array = "aoeu";
     var bad = false;
     array[bad] = array[bad];
+    _ = &bad;
 }
 export fn g() void {
     var array = "aoeu";
     var bad = false;
     _ = array[bad];
+    _ = .{ &array, &bad };
 }
 
 // error
@@ -14,4 +16,4 @@ export fn g() void {
 // target=native
 //
 // :4:11: error: expected type 'usize', found 'bool'
-// :9:15: error: expected type 'usize', found 'bool'
+// :10:15: error: expected type 'usize', found 'bool'

test/cases/compile_errors/array_init_invalid_elem_count.zig

@@ -2,27 +2,27 @@ const V = @Vector(8, u8);
 const A = [8]u8;
 comptime {
     var v: V = V{1};
-    _ = v;
+    _ = &v;
 }
 comptime {
     var v: V = V{};
-    _ = v;
+    _ = &v;
 }
 comptime {
     var a: A = A{1};
-    _ = a;
+    _ = &a;
 }
 comptime {
     var a: A = A{};
-    _ = a;
+    _ = &a;
 }
 pub export fn entry1() void {
     var bla: V = .{ 1, 2, 3, 4 };
-    _ = bla;
+    _ = &bla;
 }
 pub export fn entry2() void {
     var bla: A = .{ 1, 2, 3, 4 };
-    _ = bla;
+    _ = &bla;
 }
 const S = struct {
     list: [2]u8 = .{0},

test/cases/compile_errors/assign_inline_fn_to_non-comptime_var.zig

@@ -1,6 +1,6 @@
 export fn entry() void {
     var a = &b;
-    _ = a;
+    _ = &a;
 }
 inline fn b() void {}
 

test/cases/compile_errors/assign_local_bad_coercion.zig

@@ -9,7 +9,7 @@ export fn constEntry() u32 {
 
 export fn varEntry() u32 {
     var x: u32 = g();
-    return x;
+    return (&x).*;
 }
 
 // error

test/cases/compile_errors/assign_too_big_number_to_u16.zig

@@ -1,5 +1,5 @@
 export fn foo() void {
-    var vga_mem: u16 = 0xB8000;
+    const vga_mem: u16 = 0xB8000;
     _ = vga_mem;
 }
 
@@ -7,4 +7,4 @@ export fn foo() void {
 // backend=stage2
 // target=native
 //
-// :2:24: error: type 'u16' cannot represent integer value '753664'
+// :2:26: error: type 'u16' cannot represent integer value '753664'

test/cases/compile_errors/assigning_to_struct_or_union_fields_that_are_not_optionals_with_a_function_that_returns_an_optional.zig

@@ -10,8 +10,8 @@ const S = struct {
 export fn entry() void {
     var u = U{ .Ye = maybe(false) };
     var s = S{ .num = maybe(false) };
-    _ = u;
+    _ = &u;
-    _ = s;
+    _ = &s;
 }
 
 // error

test/cases/compile_errors/async/Frame_of_generic_function.zig

@@ -1,10 +1,10 @@
 export fn entry() void {
     var frame: @Frame(func) = undefined;
-    _ = frame;
+    _ = &frame;
 }
 fn func(comptime T: type) void {
     var x: T = undefined;
-    _ = x;
+    _ = &x;
 }
 
 // error

test/cases/compile_errors/async/async_function_depends_on_its_own_frame.zig

@@ -3,7 +3,7 @@ export fn entry() void {
 }
 fn amain() callconv(.Async) void {
     var x: [@sizeOf(@Frame(amain))]u8 = undefined;
-    _ = x;
+    _ = &x;
 }
 
 // error

test/cases/compile_errors/async/async_function_indirectly_depends_on_its_own_frame.zig

@@ -6,7 +6,7 @@ fn amain() callconv(.Async) void {
 }
 fn other() void {
     var x: [@sizeOf(@Frame(amain))]u8 = undefined;
-    _ = x;
+    _ = &x;
 }
 
 // error

test/cases/compile_errors/async/bad_alignment_in_asynccall.zig

@@ -2,6 +2,7 @@ export fn entry() void {
     var ptr: fn () callconv(.Async) void = func;
     var bytes: [64]u8 = undefined;
     _ = @asyncCall(&bytes, {}, ptr, .{});
+    _ = &ptr;
 }
 fn func() callconv(.Async) void {}
 

test/cases/compile_errors/async/const_frame_cast_to_anyframe.zig

@@ -5,7 +5,7 @@ export fn a() void {
 export fn b() void {
     const f = async func();
     var x: anyframe = &f;
-    _ = x;
+    _ = &x;
 }
 fn func() void {
     suspend {}

test/cases/compile_errors/async/indirect_recursion_of_async_functions_detected.zig

@@ -12,7 +12,7 @@ fn rangeSum(x: i32) i32 {
     frame = null;
 
     if (x == 0) return 0;
-    var child = rangeSumIndirect(x - 1);
+    const child = rangeSumIndirect(x - 1);
     return child + 1;
 }
 
@@ -23,7 +23,7 @@ fn rangeSumIndirect(x: i32) i32 {
     frame = null;
 
     if (x == 0) return 0;
-    var child = rangeSum(x - 1);
+    const child = rangeSum(x - 1);
     return child + 1;
 }
 
@@ -32,5 +32,5 @@ fn rangeSumIndirect(x: i32) i32 {
 // target=native
 //
 // tmp.zig:8:1: error: '@Frame(rangeSum)' depends on itself
-// tmp.zig:15:33: note: when analyzing type '@Frame(rangeSum)' here
+// tmp.zig:15:35: note: when analyzing type '@Frame(rangeSum)' here
-// tmp.zig:26:25: note: when analyzing type '@Frame(rangeSumIndirect)' here
+// tmp.zig:28:25: note: when analyzing type '@Frame(rangeSumIndirect)' here

test/cases/compile_errors/async/invalid_suspend_in_exported_function.zig

@@ -1,7 +1,7 @@
 export fn entry() void {
     var frame = async func();
     var result = await frame;
-    _ = result;
+    _ = &result;
 }
 fn func() void {
     suspend {}

test/cases/compile_errors/async/non_async_function_pointer_passed_to_asyncCall.zig

@@ -2,6 +2,7 @@ export fn entry() void {
     var ptr = afunc;
     var bytes: [100]u8 align(16) = undefined;
     _ = @asyncCall(&bytes, {}, ptr, .{});
+    _ = &ptr;
 }
 fn afunc() void {}
 

test/cases/compile_errors/async/prevent_bad_implicit_casting_of_anyframe_types.zig

@@ -1,17 +1,17 @@
 export fn a() void {
     var x: anyframe = undefined;
     var y: anyframe->i32 = x;
-    _ = y;
+    _ = .{ &x, &y };
 }
 export fn b() void {
     var x: i32 = undefined;
     var y: anyframe->i32 = x;
-    _ = y;
+    _ = .{ &x, &y };
 }
 export fn c() void {
     var x: @Frame(func) = undefined;
     var y: anyframe->i32 = &x;
-    _ = y;
+    _ = .{ &x, &y };
 }
 fn func() void {}
 

test/cases/compile_errors/async/runtime-known_async_function_called.zig

@@ -4,6 +4,7 @@ export fn entry() void {
 fn amain() void {
     var ptr = afunc;
     _ = ptr();
+    _ = &ptr;
 }
 fn afunc() callconv(.Async) void {}
 

test/cases/compile_errors/async/runtime-known_function_called_with_async_keyword.zig

@@ -1,6 +1,7 @@
 export fn entry() void {
     var ptr = afunc;
     _ = async ptr();
+    _ = &ptr;
 }
 
 fn afunc() callconv(.Async) void {}

test/cases/compile_errors/attempted_implicit_cast_from_const_T_to_array_len_1_T.zig

@@ -1,9 +1,9 @@
-export fn entry(byte: u8) void {
+export fn entry() void {
     const w: i32 = 1234;
     var x: *const i32 = &w;
     var y: *[1]i32 = x;
     y[0] += 1;
-    _ = byte;
+    _ = &x;
 }
 
 // error

test/cases/compile_errors/bad_alignment_in_implicit_cast_from_array_pointer_to_slice.zig

@@ -1,6 +1,6 @@
 export fn a() void {
     var x: [10]u8 = undefined;
-    var y: []align(16) u8 = &x;
+    const y: []align(16) u8 = &x;
     _ = y;
 }
 
@@ -8,5 +8,5 @@ export fn a() void {
 // backend=stage2
 // target=native
 //
-// :3:29: error: expected type '[]align(16) u8', found '*[10]u8'
+// :3:31: error: expected type '[]align(16) u8', found '*[10]u8'
-// :3:29: note: pointer alignment '1' cannot cast into pointer alignment '16'
+// :3:31: note: pointer alignment '1' cannot cast into pointer alignment '16'

test/cases/compile_errors/bad_alignment_type.zig

@@ -1,9 +1,9 @@
 export fn entry1() void {
-    var x: []align(true) i32 = undefined;
+    const x: []align(true) i32 = undefined;
     _ = x;
 }
 export fn entry2() void {
-    var x: *align(@as(f64, 12.34)) i32 = undefined;
+    const x: *align(@as(f64, 12.34)) i32 = undefined;
     _ = x;
 }
 
@@ -11,5 +11,5 @@ export fn entry2() void {
 // backend=stage2
 // target=native
 //
-// :2:20: error: expected type 'u32', found 'bool'
+// :2:22: error: expected type 'u32', found 'bool'
-// :6:19: error: fractional component prevents float value '12.34' from coercion to type 'u32'
+// :6:21: error: fractional component prevents float value '12.34' from coercion to type 'u32'

test/cases/compile_errors/bad_usage_of_call.zig

@@ -11,7 +11,7 @@ export fn entry4() void {
     @call(.never_inline, bar, .{});
 }
 export fn entry5(c: bool) void {
-    var baz = if (c) &baz1 else &baz2;
+    const baz = if (c) &baz1 else &baz2;
     @call(.compile_time, baz, .{});
 }
 export fn entry6() void {
@@ -22,6 +22,7 @@ export fn entry7() void {
 }
 pub export fn entry() void {
     var call_me: *const fn () void = undefined;
+    _ = &call_me;
     @call(.always_inline, call_me, .{});
 }
 
@@ -45,4 +46,4 @@ noinline fn dummy2() void {}
 // :15:26: error: modifier 'compile_time' requires a comptime-known function
 // :18:9: error: 'always_inline' call of noinline function
 // :21:9: error: 'always_inline' call of noinline function
-// :25:27: error: modifier 'always_inline' requires a comptime-known function
+// :26:27: error: modifier 'always_inline' requires a comptime-known function

test/cases/compile_errors/binary_OR_operator_on_error_sets.zig

@@ -1,7 +1,7 @@
 pub const A = error.A;
 pub const AB = A | error.B;
 export fn entry() void {
-    var x: AB = undefined;
+    const x: AB = undefined;
     _ = x;
 }
 

test/cases/compile_errors/bitCast_same_size_but_bit_count_mismatch.zig

@@ -1,5 +1,5 @@
 export fn entry(byte: u8) void {
-    var oops: u7 = @bitCast(byte);
+    const oops: u7 = @bitCast(byte);
     _ = oops;
 }
 
@@ -7,4 +7,4 @@ export fn entry(byte: u8) void {
 // backend=stage2
 // target=native
 //
-// :2:20: error: @bitCast size mismatch: destination type 'u7' has 7 bits but source type 'u8' has 8 bits
+// :2:22: error: @bitCast size mismatch: destination type 'u7' has 7 bits but source type 'u8' has 8 bits

test/cases/compile_errors/bitCast_with_different_sizes_inside_an_expression.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
-    var foo = (@as(u8, @bitCast(@as(f32, 1.0))) == 0xf);
+    const f: f32 = 1.0;
+    const foo = (@as(u8, @bitCast(f)) == 0xf);
     _ = foo;
 }
 
@@ -7,4 +8,4 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :2:24: error: @bitCast size mismatch: destination type 'u8' has 8 bits but source type 'f32' has 32 bits
+// :3:26: error: @bitCast size mismatch: destination type 'u8' has 8 bits but source type 'f32' has 32 bits

test/cases/compile_errors/branch_in_comptime_only_scope_uses_condbr_inline.zig

@@ -1,5 +1,6 @@
 pub export fn entry1() void {
     var x: u32 = 3;
+    _ = &x;
     _ = @shuffle(u32, [_]u32{0}, @as(@Vector(1, u32), @splat(0)), [_]i8{
         if (x > 1) 1 else -1,
     });
@@ -7,6 +8,7 @@ pub export fn entry1() void {
 
 pub export fn entry2() void {
     var y: ?i8 = -1;
+    _ = &y;
     _ = @shuffle(u32, [_]u32{0}, @as(@Vector(1, u32), @splat(0)), [_]i8{
         y orelse 1,
     });
@@ -16,6 +18,6 @@ pub export fn entry2() void {
 // backend=stage2
 // target=native
 //
-// :4:15: error: unable to evaluate comptime expression
+// :5:15: error: unable to evaluate comptime expression
-// :4:13: note: operation is runtime due to this operand
+// :5:13: note: operation is runtime due to this operand
-// :11:11: error: unable to evaluate comptime expression
+// :13:11: error: unable to evaluate comptime expression

test/cases/compile_errors/break_void_result_location.zig

@@ -10,6 +10,7 @@ export fn f2() void {
 }
 export fn f3() void {
     var t: bool = true;
+    _ = &t;
     const x: usize = while (t) {
         break;
     };
@@ -28,5 +29,5 @@ export fn f4() void {
 //
 // :2:22: error: expected type 'usize', found 'void'
 // :7:9: error: expected type 'usize', found 'void'
-// :14:9: error: expected type 'usize', found 'void'
+// :15:9: error: expected type 'usize', found 'void'
-// :20:9: error: expected type 'usize', found 'void'
+// :21:9: error: expected type 'usize', found 'void'

test/cases/compile_errors/c_pointer_to_void.zig

@@ -1,5 +1,5 @@
 export fn entry() void {
-    var a: [*c]void = undefined;
+    const a: [*c]void = undefined;
     _ = a;
 }
 
@@ -7,5 +7,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :2:16: error: C pointers cannot point to non-C-ABI-compatible type 'void'
+// :2:18: error: C pointers cannot point to non-C-ABI-compatible type 'void'
-// :2:16: note: 'void' is a zero bit type; for C 'void' use 'anyopaque'
+// :2:18: note: 'void' is a zero bit type; for C 'void' use 'anyopaque'

test/cases/compile_errors/callconv_stdcall_fastcall_thiscall_on_unsupported_platform.zig

@@ -2,15 +2,15 @@ const F1 = fn () callconv(.Stdcall) void;
 const F2 = fn () callconv(.Fastcall) void;
 const F3 = fn () callconv(.Thiscall) void;
 export fn entry1() void {
-    var a: F1 = undefined;
+    const a: F1 = undefined;
     _ = a;
 }
 export fn entry2() void {
-    var a: F2 = undefined;
+    const a: F2 = undefined;
     _ = a;
 }
 export fn entry3() void {
-    var a: F3 = undefined;
+    const a: F3 = undefined;
     _ = a;
 }
 

test/cases/compile_errors/cast_between_optional_T_where_T_is_not_a_pointer.zig

@@ -4,6 +4,7 @@ export fn entry1() void {
     var a: fnty1 = undefined;
     var b: fnty2 = undefined;
     a = b;
+    _ = &b;
 }
 
 pub const fnty3 = ?*const fn (u63) void;
@@ -11,6 +12,7 @@ export fn entry2() void {
     var a: fnty3 = undefined;
     var b: fnty2 = undefined;
     a = b;
+    _ = &b;
 }
 
 // error
@@ -21,6 +23,6 @@ export fn entry2() void {
 // :6:9: note: pointer type child 'fn (u64) void' cannot cast into pointer type child 'fn (i8) void'
 // :6:9: note: parameter 0 'u64' cannot cast into 'i8'
 // :6:9: note: unsigned 64-bit int cannot represent all possible signed 8-bit values
-// :13:9: error: expected type '?*const fn (u63) void', found '?*const fn (u64) void'
+// :14:9: error: expected type '?*const fn (u63) void', found '?*const fn (u64) void'
-// :13:9: note: pointer type child 'fn (u64) void' cannot cast into pointer type child 'fn (u63) void'
+// :14:9: note: pointer type child 'fn (u64) void' cannot cast into pointer type child 'fn (u63) void'
-// :13:9: note: parameter 0 'u64' cannot cast into 'u63'
+// :14:9: note: parameter 0 'u64' cannot cast into 'u63'

test/cases/compile_errors/cast_error_union_of_global_error_set_to_error_union_of_smaller_error_set.zig

@@ -1,6 +1,6 @@
 const SmallErrorSet = error{A};
 export fn entry() void {
-    var x: SmallErrorSet!i32 = foo();
+    const x: SmallErrorSet!i32 = foo();
     _ = x;
 }
 fn foo() anyerror!i32 {
@@ -11,5 +11,5 @@ fn foo() anyerror!i32 {
 // backend=stage2
 // target=native
 //
-// :3:35: error: expected type 'error{A}!i32', found 'anyerror!i32'
+// :3:37: error: expected type 'error{A}!i32', found 'anyerror!i32'
-// :3:35: note: global error set cannot cast into a smaller set
+// :3:37: note: global error set cannot cast into a smaller set

test/cases/compile_errors/cast_global_error_set_to_error_set.zig

@@ -1,6 +1,6 @@
 const SmallErrorSet = error{A};
 export fn entry() void {
-    var x: SmallErrorSet = foo();
+    const x: SmallErrorSet = foo();
     _ = x;
 }
 fn foo() anyerror {
@@ -11,5 +11,5 @@ fn foo() anyerror {
 // backend=stage2
 // target=native
 //
-// :3:31: error: expected type 'error{A}', found 'anyerror'
+// :3:33: error: expected type 'error{A}', found 'anyerror'
-// :3:31: note: global error set cannot cast into a smaller set
+// :3:33: note: global error set cannot cast into a smaller set

test/cases/compile_errors/catch_on_undefined_value.zig

@@ -1,5 +1,5 @@
 comptime {
-    var a: anyerror!bool = undefined;
+    const a: anyerror!bool = undefined;
     if (a catch false) {}
 }
 

test/cases/compile_errors/compare_optional_to_non_optional_with_incomparable_type.zig

@@ -1,6 +1,6 @@
 export fn entry() void {
-    var x: ?[3]i32 = undefined;
+    const x: ?[3]i32 = undefined;
-    var y: [3]i32 = undefined;
+    const y: [3]i32 = undefined;
     _ = (x == y);
 }
 

test/cases/compile_errors/comparison_operators_with_undefined_value.zig

@@ -1,36 +1,36 @@
 // operator ==
 comptime {
-    var a: i64 = undefined;
+    const a: i64 = undefined;
     var x: i32 = 0;
     if (a == a) x += 1;
 }
 // operator !=
 comptime {
-    var a: i64 = undefined;
+    const a: i64 = undefined;
     var x: i32 = 0;
     if (a != a) x += 1;
 }
 // operator >
 comptime {
-    var a: i64 = undefined;
+    const a: i64 = undefined;
     var x: i32 = 0;
     if (a > a) x += 1;
 }
 // operator <
 comptime {
-    var a: i64 = undefined;
+    const a: i64 = undefined;
     var x: i32 = 0;
     if (a < a) x += 1;
 }
 // operator >=
 comptime {
-    var a: i64 = undefined;
+    const a: i64 = undefined;
     var x: i32 = 0;
     if (a >= a) x += 1;
 }
 // operator <=
 comptime {
-    var a: i64 = undefined;
+    const a: i64 = undefined;
     var x: i32 = 0;
     if (a <= a) x += 1;
 }

test/cases/compile_errors/compile_error_in_struct_init_expression.zig

@@ -3,7 +3,7 @@ const Foo = struct {
     b: i32,
 };
 export fn entry() void {
-    var x = Foo{
+    const x: Foo = .{
         .b = 5,
     };
     _ = x;

test/cases/compile_errors/compile_time_null_ptr_cast.zig

@@ -1,5 +1,5 @@
 comptime {
-    var opt_ptr: ?*i32 = null;
+    const opt_ptr: ?*i32 = null;
     const ptr: *i32 = @ptrCast(opt_ptr);
     _ = ptr;
 }

test/cases/compile_errors/compile_time_undef_ptr_cast.zig

@@ -1,6 +1,7 @@
 comptime {
     var undef_ptr: *i32 = undefined;
     const ptr: *i32 = @ptrCast(undef_ptr);
+    _ = &undef_ptr;
     _ = ptr;
 }
 

test/cases/compile_errors/comptime_cast_enum_to_union_but_field_has_payload.zig

@@ -6,7 +6,7 @@ const Value = union(Letter) {
 };
 export fn entry() void {
     var x: Value = Letter.A;
-    _ = x;
+    _ = &x;
 }
 
 // error

test/cases/compile_errors/comptime_continue_inside_runtime_if_bool.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var p: usize = undefined;
+    _ = &p;
     comptime var q = true;
     inline while (q) {
         if (p == 11) continue;
@@ -11,5 +12,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :5:22: error: comptime control flow inside runtime block
+// :6:22: error: comptime control flow inside runtime block
-// :5:15: note: runtime control flow here
+// :6:15: note: runtime control flow here

test/cases/compile_errors/comptime_continue_inside_runtime_if_error.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var p: anyerror!i32 = undefined;
+    _ = &p;
     comptime var q = true;
     inline while (q) {
         if (p) |_| continue else |_| {}
@@ -11,5 +12,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :5:20: error: comptime control flow inside runtime block
+// :6:20: error: comptime control flow inside runtime block
-// :5:13: note: runtime control flow here
+// :6:13: note: runtime control flow here

test/cases/compile_errors/comptime_continue_inside_runtime_if_optional.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var p: ?i32 = undefined;
+    _ = &p;
     comptime var q = true;
     inline while (q) {
         if (p) |_| continue;
@@ -11,5 +12,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :5:20: error: comptime control flow inside runtime block
+// :6:20: error: comptime control flow inside runtime block
-// :5:13: note: runtime control flow here
+// :6:13: note: runtime control flow here

test/cases/compile_errors/comptime_continue_inside_runtime_switch.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var p: i32 = undefined;
+    _ = &p;
     comptime var q = true;
     inline while (q) {
         switch (p) {
@@ -14,5 +15,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :6:19: error: comptime control flow inside runtime block
+// :7:19: error: comptime control flow inside runtime block
-// :5:17: note: runtime control flow here
+// :6:17: note: runtime control flow here

test/cases/compile_errors/comptime_continue_inside_runtime_while_bool.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var p: usize = undefined;
+    _ = &p;
     comptime var q = true;
     outer: inline while (q) {
         while (p == 11) continue :outer;
@@ -11,5 +12,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :5:25: error: comptime control flow inside runtime block
+// :6:25: error: comptime control flow inside runtime block
-// :5:18: note: runtime control flow here
+// :6:18: note: runtime control flow here

test/cases/compile_errors/comptime_continue_inside_runtime_while_error.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var p: anyerror!usize = undefined;
+    _ = &p;
     comptime var q = true;
     outer: inline while (q) {
         while (p) |_| {
@@ -13,5 +14,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :6:13: error: comptime control flow inside runtime block
+// :7:13: error: comptime control flow inside runtime block
-// :5:16: note: runtime control flow here
+// :6:16: note: runtime control flow here

test/cases/compile_errors/comptime_continue_inside_runtime_while_optional.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var p: ?usize = undefined;
+    _ = &p;
     comptime var q = true;
     outer: inline while (q) {
         while (p) |_| continue :outer;
@@ -11,5 +12,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :5:23: error: comptime control flow inside runtime block
+// :6:23: error: comptime control flow inside runtime block
-// :5:16: note: runtime control flow here
+// :6:16: note: runtime control flow here

test/cases/compile_errors/comptime_continue_to_outer_inline_loop.zig

@@ -1,5 +1,6 @@
 pub export fn entry() void {
     var a = false;
+    _ = &a;
     const arr1 = .{ 1, 2, 3 };
     loop: inline for (arr1) |val1| {
         _ = val1;
@@ -17,5 +18,5 @@ pub export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :9:30: error: comptime control flow inside runtime block
+// :10:30: error: comptime control flow inside runtime block
-// :6:13: note: runtime control flow here
+// :7:13: note: runtime control flow here

test/cases/compile_errors/comptime_if_inside_runtime_for.zig

@@ -1,8 +1,9 @@
 export fn entry() void {
     var x: u32 = 0;
+    _ = &x;
     for (0..1, 1..2) |_, _| {
         var y = x + if (x == 0) 1 else 0;
-        _ = y;
+        _ = &y;
     }
 }
 
@@ -10,5 +11,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :4:21: error: value with comptime-only type 'comptime_int' depends on runtime control flow
+// :5:21: error: value with comptime-only type 'comptime_int' depends on runtime control flow
-// :3:10: note: runtime control flow here
+// :4:10: note: runtime control flow here

test/cases/compile_errors/comptime_slice_of_an_undefined_slice.zig

@@ -1,7 +1,7 @@
 comptime {
     var a: []u8 = undefined;
     var b = a[0..10];
-    _ = b;
+    _ = &b;
 }
 
 // error

test/cases/compile_errors/comptime_struct_field_no_init_value.zig

@@ -3,7 +3,7 @@ const Foo = struct {
 };
 export fn entry() void {
     var f: Foo = undefined;
-    _ = f;
+    _ = &f;
 }
 
 // error

test/cases/compile_errors/comptime_vector_overflow_shows_the_index.zig

@@ -2,7 +2,7 @@ comptime {
     var a: @Vector(4, u8) = [_]u8{ 1, 2, 255, 4 };
     var b: @Vector(4, u8) = [_]u8{ 5, 6, 1, 8 };
     var x = a + b;
-    _ = x;
+    _ = .{ &a, &b, &x };
 }
 
 // error

test/cases/compile_errors/constant_inside_comptime_function_has_compile_error.zig

@@ -1,9 +1,7 @@
 const ContextAllocator = MemoryPool(usize);
 
 pub fn MemoryPool(comptime T: type) type {
-    const free_list_t = @compileError(
+    const free_list_t = @compileError("aoeu");
-        "aoeu",
-    );
     _ = T;
 
     return struct {
@@ -12,7 +10,7 @@ pub fn MemoryPool(comptime T: type) type {
 }
 
 export fn entry() void {
-    var allocator: ContextAllocator = undefined;
+    const allocator: ContextAllocator = undefined;
     _ = allocator;
 }
 

test/cases/compile_errors/deref_on_undefined_value.zig

@@ -1,5 +1,5 @@
 comptime {
-    var a: *u8 = undefined;
+    const a: *u8 = undefined;
     _ = a.*;
 }
 

test/cases/compile_errors/deref_slice_and_get_len_field.zig

@@ -1,6 +1,7 @@
 export fn entry() void {
     var a: []u8 = undefined;
     _ = a.*.len;
+    _ = &a;
 }
 
 // error

test/cases/compile_errors/dereference_an_array.zig

@@ -1,6 +1,7 @@
 var s_buffer: [10]u8 = undefined;
 pub fn pass(in: []u8) []u8 {
     var out = &s_buffer;
+    _ = &out;
     out.*.* = in[0];
     return out.*[0..1];
 }
@@ -13,4 +14,4 @@ export fn entry() usize {
 // backend=stage2
 // target=native
 //
-// :4:10: error: cannot dereference non-pointer type '[10]u8'
+// :5:10: error: cannot dereference non-pointer type '[10]u8'

test/cases/compile_errors/dereferencing_invalid_payload_ptr_at_comptime.zig

@@ -16,7 +16,7 @@ comptime {
     _ = payload_ptr.*;
 }
 comptime {
-    var val: u8 = 15;
+    const val: u8 = 15;
     var err_union: anyerror!u8 = val;
 
     const payload_ptr = &(err_union catch unreachable);

test/cases/compile_errors/directly_embedding_opaque_type_in_struct_and_union.zig

@@ -8,11 +8,11 @@ const Bar = union {
 };
 export fn a() void {
     var foo: Foo = undefined;
-    _ = foo;
+    _ = &foo;
 }
 export fn b() void {
     var bar: Bar = undefined;
-    _ = bar;
+    _ = &bar;
 }
 export fn c() void {
     const baz = &@as(O, undefined);

test/cases/compile_errors/div_on_undefined_value.zig

@@ -1,6 +1,7 @@
 comptime {
     var a: i64 = undefined;
     _ = a / a;
+    _ = &a;
 }
 
 // error

test/cases/compile_errors/double_pointer_to_anyopaque_pointer.zig

@@ -11,12 +11,13 @@ pub export fn entry2() void {
 fn func(_: ?*anyopaque) void {}
 pub export fn entry3() void {
     var x: *?*usize = undefined;
-
+    _ = &x;
     const ptr: *const anyopaque = x;
     _ = ptr;
 }
 export fn entry4() void {
     var a: []*u32 = undefined;
+    _ = &a;
     var b: []anyopaque = undefined;
     b = a;
 }
@@ -32,5 +33,5 @@ export fn entry4() void {
 // :11:12: note: parameter type declared here
 // :15:35: error: expected type '*const anyopaque', found '*?*usize'
 // :15:35: note: cannot implicitly cast double pointer '*?*usize' to anyopaque pointer '*const anyopaque'
-// :21:9: error: expected type '[]anyopaque', found '[]*u32'
+// :22:9: error: expected type '[]anyopaque', found '[]*u32'
-// :21:9: note: cannot implicitly cast double pointer '[]*u32' to anyopaque pointer '[]anyopaque'
+// :22:9: note: cannot implicitly cast double pointer '[]*u32' to anyopaque pointer '[]anyopaque'

test/cases/compile_errors/empty_switch_on_an_integer.zig

@@ -1,5 +1,5 @@
 export fn entry() void {
-    var x: u32 = 0;
+    const x: u32 = 0;
     switch (x) {}
 }
 

test/cases/compile_errors/enum_backed_by_comptime_int_must_be_comptime.zig

@@ -1,7 +1,7 @@
 pub export fn entry() void {
     const E = enum(comptime_int) { a, b, c, _ };
     var e: E = .a;
-    _ = e;
+    _ = &e;
 }
 
 // error

test/cases/compile_errors/enum_field_value_references_enum.zig

@@ -3,7 +3,7 @@ pub const Foo = enum(c_int) {
     C = D,
 };
 export fn entry() void {
-    var s: Foo = Foo.E;
+    const s: Foo = Foo.E;
     _ = s;
 }
 const D = 1;

test/cases/compile_errors/enum_in_field_count_range_but_not_matching_tag.zig

@@ -3,7 +3,7 @@ const Foo = enum(u32) {
     B = 11,
 };
 export fn entry() void {
-    var x: Foo = @enumFromInt(0);
+    const x: Foo = @enumFromInt(0);
     _ = x;
 }
 
@@ -11,5 +11,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :6:18: error: enum 'tmp.Foo' has no tag with value '0'
+// :6:20: error: enum 'tmp.Foo' has no tag with value '0'
 // :1:13: note: enum declared here

test/cases/compile_errors/enum_value_already_taken.zig

@@ -6,7 +6,7 @@ const MultipleChoice = enum(u32) {
     E = 60,
 };
 export fn entry() void {
-    var x = MultipleChoice.C;
+    const x = MultipleChoice.C;
     _ = x;
 }
 

test/cases/compile_errors/error_in_struct_initializer_doesnt_crash_the_compiler.zig

@@ -4,7 +4,7 @@ pub export fn entry() void {
         e: u8,
     };
     var a = .{@sizeOf(bitfield)};
-    _ = a;
+    _ = &a;
 }
 
 // error

test/cases/compile_errors/error_union_operator_with_non_error_set_LHS.zig

@@ -1,6 +1,6 @@
 comptime {
     const z = i32!i32;
-    var x: z = undefined;
+    const x: z = undefined;
     _ = x;
 }
 

test/cases/compile_errors/error_when_evaluating_return_type.zig

@@ -6,7 +6,7 @@ const Foo = struct {
     }
 };
 export fn entry() void {
-    var rule_set = try Foo.init();
+    const rule_set = try Foo.init();
     _ = rule_set;
 }
 

test/cases/compile_errors/explain_why_generic_fn_is_called_at_comptime.zig

@@ -11,12 +11,13 @@ fn foo(a: u8, comptime PtrTy: type) S(PtrTy) {
 }
 pub export fn entry() void {
     var a: u8 = 1;
+    _ = &a;
     _ = foo(a, fn () void);
 }
 // error
 // backend=stage2
 // target=native
 //
-// :14:13: error: unable to resolve comptime value
+// :15:13: error: unable to resolve comptime value
-// :14:13: note: argument to function being called at comptime must be comptime-known
+// :15:13: note: argument to function being called at comptime must be comptime-known
 // :9:38: note: expression is evaluated at comptime because the generic function was instantiated with a comptime-only return type

test/cases/compile_errors/explicit_error_set_cast_known_at_comptime_violates_error_sets.zig

@@ -1,8 +1,8 @@
 const Set1 = error{ A, B };
 const Set2 = error{ A, C };
 comptime {
-    var x = Set1.B;
+    const x = Set1.B;
-    var y: Set2 = @errorCast(x);
+    const y: Set2 = @errorCast(x);
     _ = y;
 }
 
@@ -10,4 +10,4 @@ comptime {
 // backend=stage2
 // target=native
 //
-// :5:19: error: 'error.B' not a member of error set 'error{C,A}'
+// :5:21: error: 'error.B' not a member of error set 'error{C,A}'

test/cases/compile_errors/explicitly_casting_non_tag_type_to_enum.zig

@@ -7,7 +7,7 @@ const Small = enum(u2) {
 
 export fn entry() void {
     var y = @as(f32, 3);
-    var x: Small = @enumFromInt(y);
+    const x: Small = @enumFromInt((&y).*);
     _ = x;
 }
 
@@ -15,4 +15,4 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :10:33: error: expected integer type, found 'f32'
+// :10:39: error: expected integer type, found 'f32'

test/cases/compile_errors/extern_union_field_missing_type.zig

@@ -2,7 +2,7 @@ const Letter = extern union {
     A,
 };
 export fn entry() void {
-    var a = Letter{ .A = {} };
+    const a: Letter = .{ .A = {} };
     _ = a;
 }
 

test/cases/compile_errors/extern_union_given_enum_tag_type.zig

@@ -9,7 +9,7 @@ const Payload = extern union(Letter) {
     C: bool,
 };
 export fn entry() void {
-    var a = Payload{ .A = 1234 };
+    const a: Payload = .{ .A = 1234 };
     _ = a;
 }
 

test/cases/compile_errors/field_access_of_slices.zig

@@ -1,5 +1,6 @@
 export fn entry() void {
     var slice: []i32 = undefined;
+    _ = &slice;
     const info = @TypeOf(slice).unknown;
     _ = info;
 }
@@ -8,5 +9,5 @@ export fn entry() void {
 // backend=stage2
 // target=native
 //
-// :3:32: error: type '[]i32' has no members
+// :4:32: error: type '[]i32' has no members
-// :3:32: note: slice values have 'len' and 'ptr' members
+// :4:32: note: slice values have 'len' and 'ptr' members