diff --git a/test/behavior.zig b/test/behavior.zig
index 923c54b400..b251c418e7 100644
--- a/test/behavior.zig
+++ b/test/behavior.zig
@@ -10,41 +10,32 @@ test {
     _ = @import("behavior/bugs/655.zig");
     _ = @import("behavior/bugs/679.zig");
     _ = @import("behavior/bugs/704.zig");
-    _ = @import("behavior/bugs/1111.zig");
     _ = @import("behavior/bugs/1486.zig");
     _ = @import("behavior/bugs/2346.zig");
     _ = @import("behavior/bugs/2692.zig");
     _ = @import("behavior/bugs/2889.zig");
-    _ = @import("behavior/bugs/3046.zig");
     _ = @import("behavior/bugs/3586.zig");
     _ = @import("behavior/bugs/4560.zig");
     _ = @import("behavior/bugs/4769_a.zig");
     _ = @import("behavior/bugs/4769_b.zig");
-    _ = @import("behavior/bugs/4954.zig");
     _ = @import("behavior/bugs/6850.zig");
-    _ = @import("behavior/byval_arg_var.zig");
     _ = @import("behavior/call.zig");
     _ = @import("behavior/cast.zig");
     _ = @import("behavior/defer.zig");
     _ = @import("behavior/enum.zig");
     _ = @import("behavior/error.zig");
-    _ = @import("behavior/fn_in_struct_in_comptime.zig");
     _ = @import("behavior/generics.zig");
     _ = @import("behavior/hasdecl.zig");
     _ = @import("behavior/hasfield.zig");
     _ = @import("behavior/if.zig");
     _ = @import("behavior/import.zig");
-    _ = @import("behavior/incomplete_struct_param_tld.zig");
     _ = @import("behavior/int128.zig");
-    _ = @import("behavior/inttoptr.zig");
     _ = @import("behavior/member_func.zig");
     _ = @import("behavior/null.zig");
     _ = @import("behavior/optional.zig");
     _ = @import("behavior/pointers.zig");
     _ = @import("behavior/ptrcast.zig");
     _ = @import("behavior/pub_enum.zig");
-    _ = @import("behavior/ref_var_in_if_after_if_2nd_switch_prong.zig");
-    _ = @import("behavior/slice_sentinel_comptime.zig");
     _ = @import("behavior/struct.zig");
     _ = @import("behavior/this.zig");
     _ = @import("behavior/translate_c_macros.zig");
@@ -56,22 +47,17 @@ test {
     if (builtin.object_format != .c) {
         // Tests that pass for stage1 and stage2 but not the C backend.
         _ = @import("behavior/align_llvm.zig");
-        _ = @import("behavior/alignof.zig");
         _ = @import("behavior/array.zig");
         _ = @import("behavior/atomics.zig");
         _ = @import("behavior/basic_llvm.zig");
         _ = @import("behavior/bugs/394.zig");
-        _ = @import("behavior/bugs/656.zig");
         _ = @import("behavior/bugs/1277.zig");
-        _ = @import("behavior/bugs/1381.zig");
         _ = @import("behavior/bugs/1500.zig");
         _ = @import("behavior/bugs/1741.zig");
         _ = @import("behavior/bugs/2006.zig");
-        _ = @import("behavior/bugs/2578.zig");
-        _ = @import("behavior/bugs/3007.zig");
         _ = @import("behavior/bugs/3112.zig");
-        _ = @import("behavior/bugs/7250.zig");
         _ = @import("behavior/cast_llvm.zig");
+        _ = @import("behavior/error.zig");
         _ = @import("behavior/eval.zig");
         _ = @import("behavior/floatop.zig");
         _ = @import("behavior/fn.zig");
@@ -79,7 +65,6 @@ test {
         _ = @import("behavior/generics_llvm.zig");
         _ = @import("behavior/math.zig");
         _ = @import("behavior/maximum_minimum.zig");
-        _ = @import("behavior/namespace_depends_on_compile_var.zig");
         _ = @import("behavior/null_llvm.zig");
         _ = @import("behavior/optional_llvm.zig");
         _ = @import("behavior/popcount.zig");
@@ -99,6 +84,7 @@ test {
             _ = @import("behavior/slice_stage2.zig");
         } else {
             _ = @import("behavior/align_stage1.zig");
+            _ = @import("behavior/alignof.zig");
             _ = @import("behavior/array_stage1.zig");
             if (builtin.os.tag != .wasi) {
                 _ = @import("behavior/asm.zig");
@@ -110,15 +96,18 @@ test {
             _ = @import("behavior/bitreverse.zig");
             _ = @import("behavior/bugs/421.zig");
             _ = @import("behavior/bugs/529.zig");
+            _ = @import("behavior/bugs/656.zig");
             _ = @import("behavior/bugs/718.zig");
             _ = @import("behavior/bugs/726.zig");
             _ = @import("behavior/bugs/828.zig");
             _ = @import("behavior/bugs/920.zig");
             _ = @import("behavior/bugs/1025.zig");
             _ = @import("behavior/bugs/1076.zig");
+            _ = @import("behavior/bugs/1111.zig");
             _ = @import("behavior/bugs/1120.zig");
             _ = @import("behavior/bugs/1310.zig");
             _ = @import("behavior/bugs/1322.zig");
+            _ = @import("behavior/bugs/1381.zig");
             _ = @import("behavior/bugs/1421.zig");
             _ = @import("behavior/bugs/1442.zig");
             _ = @import("behavior/bugs/1607.zig");
@@ -126,11 +115,15 @@ test {
             _ = @import("behavior/bugs/1851.zig");
             _ = @import("behavior/bugs/1914.zig");
             _ = @import("behavior/bugs/2114.zig");
+            _ = @import("behavior/bugs/2578.zig");
+            _ = @import("behavior/bugs/3007.zig");
+            _ = @import("behavior/bugs/3046.zig");
             _ = @import("behavior/bugs/3367.zig");
             _ = @import("behavior/bugs/3384.zig");
             _ = @import("behavior/bugs/3742.zig");
             _ = @import("behavior/bugs/3779.zig");
             _ = @import("behavior/bugs/4328.zig");
+            _ = @import("behavior/bugs/4954.zig");
             _ = @import("behavior/bugs/5398.zig");
             _ = @import("behavior/bugs/5413.zig");
             _ = @import("behavior/bugs/5474.zig");
@@ -140,10 +133,12 @@ test {
             _ = @import("behavior/bugs/7003.zig");
             _ = @import("behavior/bugs/7027.zig");
             _ = @import("behavior/bugs/7047.zig");
+            _ = @import("behavior/bugs/7250.zig");
             _ = @import("behavior/bugs/9584.zig");
             _ = @import("behavior/bugs/9967.zig");
             _ = @import("behavior/bugs/10147.zig");
             _ = @import("behavior/byteswap.zig");
+            _ = @import("behavior/byval_arg_var.zig");
             _ = @import("behavior/call_stage1.zig");
             _ = @import("behavior/cast_stage1.zig");
             _ = @import("behavior/const_slice_child.zig");
@@ -155,22 +150,28 @@ test {
             _ = @import("behavior/floatop_stage1.zig");
             _ = @import("behavior/fn_stage1.zig");
             _ = @import("behavior/fn_delegation.zig");
+            _ = @import("behavior/fn_in_struct_in_comptime.zig");
             _ = @import("behavior/for_stage1.zig");
             _ = @import("behavior/if_stage1.zig");
+            _ = @import("behavior/incomplete_struct_param_tld.zig");
+            _ = @import("behavior/inttoptr.zig");
             _ = @import("behavior/ir_block_deps.zig");
             _ = @import("behavior/math_stage1.zig");
             _ = @import("behavior/merge_error_sets.zig");
             _ = @import("behavior/misc.zig");
             _ = @import("behavior/muladd.zig");
+            _ = @import("behavior/namespace_depends_on_compile_var.zig");
             _ = @import("behavior/null_stage1.zig");
             _ = @import("behavior/optional_stage1.zig");
             _ = @import("behavior/pointers_stage1.zig");
             _ = @import("behavior/popcount_stage1.zig");
             _ = @import("behavior/ptrcast_stage1.zig");
+            _ = @import("behavior/ref_var_in_if_after_if_2nd_switch_prong.zig");
             _ = @import("behavior/reflection.zig");
             _ = @import("behavior/select.zig");
             _ = @import("behavior/shuffle.zig");
             _ = @import("behavior/sizeof_and_typeof_stage1.zig");
+            _ = @import("behavior/slice_sentinel_comptime.zig");
             _ = @import("behavior/slice_stage1.zig");
             _ = @import("behavior/struct_contains_null_ptr_itself.zig");
             _ = @import("behavior/struct_contains_slice_of_itself.zig");
@@ -185,6 +186,7 @@ test {
             _ = @import("behavior/typename.zig");
             _ = @import("behavior/union_stage1.zig");
             _ = @import("behavior/union_with_members.zig");
+            _ = @import("behavior/usingnamespace_stage1.zig");
             _ = @import("behavior/var_args.zig");
             _ = @import("behavior/vector.zig");
             if (builtin.target.cpu.arch == .wasm32) {
diff --git a/test/behavior/struct.zig b/test/behavior/struct.zig
index 1e47877fd6..eeaa80ed69 100644
--- a/test/behavior/struct.zig
+++ b/test/behavior/struct.zig
@@ -6,55 +6,12 @@ const expectEqual = std.testing.expectEqual;
 const expectEqualSlices = std.testing.expectEqualSlices;
 const maxInt = std.math.maxInt;
 
-top_level_field: i32,
-
-test "top level fields" {
-    var instance = @This(){
-        .top_level_field = 1234,
-    };
-    instance.top_level_field += 1;
-    try expect(@as(i32, 1235) == instance.top_level_field);
-}
-
 const StructWithNoFields = struct {
     fn add(a: i32, b: i32) i32 {
         return a + b;
     }
 };
 
-const StructFoo = struct {
-    a: i32,
-    b: bool,
-    c: f32,
-};
-
-test "structs" {
-    var foo: StructFoo = undefined;
-    @memset(@ptrCast([*]u8, &foo), 0, @sizeOf(StructFoo));
-    foo.a += 1;
-    foo.b = foo.a == 1;
-    try testFoo(foo);
-    testMutation(&foo);
-    try expect(foo.c == 100);
-}
-fn testFoo(foo: StructFoo) !void {
-    try expect(foo.b);
-}
-fn testMutation(foo: *StructFoo) void {
-    foo.c = 100;
-}
-
-test "struct byval assign" {
-    var foo1: StructFoo = undefined;
-    var foo2: StructFoo = undefined;
-
-    foo1.a = 1234;
-    foo2.a = 0;
-    try expect(foo2.a == 0);
-    foo2 = foo1;
-    try expect(foo2.a == 1234);
-}
-
 test "call struct static method" {
     const result = StructWithNoFields.add(3, 4);
     try expect(result == 7);
@@ -84,23 +41,6 @@ const Val = struct {
     x: i32,
 };
 
-test "fn call of struct field" {
-    const Foo = struct {
-        ptr: fn () i32,
-    };
-    const S = struct {
-        fn aFunc() i32 {
-            return 13;
-        }
-
-        fn callStructField(foo: Foo) i32 {
-            return foo.ptr();
-        }
-    };
-
-    try expect(S.callStructField(Foo{ .ptr = S.aFunc }) == 13);
-}
-
 test "struct initializer" {
     const val = Val{ .x = 42 };
     try expect(val.x == 42);
@@ -118,84 +58,3 @@ test "call member function directly" {
     const result = MemberFnTestFoo.member(instance);
     try expect(result == 1234);
 }
-
-test "store member function in variable" {
-    const instance = MemberFnTestFoo{ .x = 1234 };
-    const memberFn = MemberFnTestFoo.member;
-    const result = memberFn(instance);
-    try expect(result == 1234);
-}
-
-test "member functions" {
-    const r = MemberFnRand{ .seed = 1234 };
-    try expect(r.getSeed() == 1234);
-}
-const MemberFnRand = struct {
-    seed: u32,
-    pub fn getSeed(r: *const MemberFnRand) u32 {
-        return r.seed;
-    }
-};
-
-test "return struct byval from function" {
-    const bar = makeBar2(1234, 5678);
-    try expect(bar.y == 5678);
-}
-const Bar = struct {
-    x: i32,
-    y: i32,
-};
-fn makeBar2(x: i32, y: i32) Bar {
-    return Bar{
-        .x = x,
-        .y = y,
-    };
-}
-
-test "call method with mutable reference to struct with no fields" {
-    const S = struct {
-        fn doC(s: *const @This()) bool {
-            _ = s;
-            return true;
-        }
-        fn do(s: *@This()) bool {
-            _ = s;
-            return true;
-        }
-    };
-
-    var s = S{};
-    try expect(S.doC(&s));
-    try expect(s.doC());
-    try expect(S.do(&s));
-    try expect(s.do());
-}
-
-test "usingnamespace within struct scope" {
-    const S = struct {
-        usingnamespace struct {
-            pub fn inner() i32 {
-                return 42;
-            }
-        };
-    };
-    try expect(@as(i32, 42) == S.inner());
-}
-
-test "struct field init with catch" {
-    const S = struct {
-        fn doTheTest() !void {
-            var x: anyerror!isize = 1;
-            var req = Foo{
-                .field = x catch undefined,
-            };
-            try expect(req.field == 1);
-        }
-
-        pub const Foo = extern struct {
-            field: isize,
-        };
-    };
-    try S.doTheTest();
-    comptime try S.doTheTest();
-}
diff --git a/test/behavior/struct_llvm.zig b/test/behavior/struct_llvm.zig
index 35c71fe7a2..a809905cef 100644
--- a/test/behavior/struct_llvm.zig
+++ b/test/behavior/struct_llvm.zig
@@ -6,6 +6,44 @@ const expectEqual = std.testing.expectEqual;
 const expectEqualSlices = std.testing.expectEqualSlices;
 const maxInt = std.math.maxInt;
 
+const StructWithNoFields = struct {
+    fn add(a: i32, b: i32) i32 {
+        return a + b;
+    }
+};
+
+const StructFoo = struct {
+    a: i32,
+    b: bool,
+    c: f32,
+};
+test "structs" {
+    var foo: StructFoo = undefined;
+    @memset(@ptrCast([*]u8, &foo), 0, @sizeOf(StructFoo));
+    foo.a += 1;
+    foo.b = foo.a == 1;
+    try testFoo(foo);
+    testMutation(&foo);
+    try expect(foo.c == 100);
+}
+fn testFoo(foo: StructFoo) !void {
+    try expect(foo.b);
+}
+fn testMutation(foo: *StructFoo) void {
+    foo.c = 100;
+}
+
+test "struct byval assign" {
+    var foo1: StructFoo = undefined;
+    var foo2: StructFoo = undefined;
+
+    foo1.a = 1234;
+    foo2.a = 0;
+    try expect(foo2.a == 0);
+    foo2 = foo1;
+    try expect(foo2.a == 1234);
+}
+
 const Node = struct {
     val: Val,
     next: *Node,
@@ -43,6 +81,32 @@ const VoidStructFieldsFoo = struct {
     c: void,
 };
 
+test "member functions" {
+    const r = MemberFnRand{ .seed = 1234 };
+    try expect(r.getSeed() == 1234);
+}
+const MemberFnRand = struct {
+    seed: u32,
+    pub fn getSeed(r: *const MemberFnRand) u32 {
+        return r.seed;
+    }
+};
+
+test "return struct byval from function" {
+    const bar = makeBar2(1234, 5678);
+    try expect(bar.y == 5678);
+}
+const Bar = struct {
+    x: i32,
+    y: i32,
+};
+fn makeBar2(x: i32, y: i32) Bar {
+    return Bar{
+        .x = x,
+        .y = y,
+    };
+}
+
 test "return empty struct from fn" {
     _ = testReturnEmptyStructFromFn();
 }
@@ -50,54 +114,3 @@ const EmptyStruct2 = struct {};
 fn testReturnEmptyStructFromFn() EmptyStruct2 {
     return EmptyStruct2{};
 }
-
-test "pass slice of empty struct to fn" {
-    try expect(testPassSliceOfEmptyStructToFn(&[_]EmptyStruct2{EmptyStruct2{}}) == 1);
-}
-fn testPassSliceOfEmptyStructToFn(slice: []const EmptyStruct2) usize {
-    return slice.len;
-}
-
-test "for loop over pointers to struct, getting field from struct pointer" {
-    const S = struct {
-        const Foo = struct {
-            name: []const u8,
-        };
-
-        var ok = true;
-
-        fn eql(a: []const u8) bool {
-            _ = a;
-            return true;
-        }
-
-        const ArrayList = struct {
-            fn toSlice(self: *ArrayList) []*Foo {
-                _ = self;
-                return @as([*]*Foo, undefined)[0..0];
-            }
-        };
-
-        fn doTheTest() !void {
-            var objects: ArrayList = undefined;
-
-            for (objects.toSlice()) |obj| {
-                if (eql(obj.name)) {
-                    ok = false;
-                }
-            }
-
-            try expect(ok);
-        }
-    };
-    try S.doTheTest();
-}
-
-test "self-referencing struct via array member" {
-    const T = struct {
-        children: [1]*@This(),
-    };
-    var x: T = undefined;
-    x = T{ .children = .{&x} };
-    try expect(x.children[0] == &x);
-}
diff --git a/test/behavior/struct_stage1.zig b/test/behavior/struct_stage1.zig
index 4b78bd13d3..a04e54e89b 100644
--- a/test/behavior/struct_stage1.zig
+++ b/test/behavior/struct_stage1.zig
@@ -6,6 +6,16 @@ const expectEqual = std.testing.expectEqual;
 const expectEqualSlices = std.testing.expectEqualSlices;
 const maxInt = std.math.maxInt;
 
+top_level_field: i32,
+
+test "top level fields" {
+    var instance = @This(){
+        .top_level_field = 1234,
+    };
+    instance.top_level_field += 1;
+    try expectEqual(@as(i32, 1235), instance.top_level_field);
+}
+
 const StructFoo = struct {
     a: i32,
     b: bool,
@@ -21,6 +31,36 @@ const Val = struct {
     x: i32,
 };
 
+test "fn call of struct field" {
+    const Foo = struct {
+        ptr: fn () i32,
+    };
+    const S = struct {
+        fn aFunc() i32 {
+            return 13;
+        }
+
+        fn callStructField(foo: Foo) i32 {
+            return foo.ptr();
+        }
+    };
+
+    try expect(S.callStructField(Foo{ .ptr = S.aFunc }) == 13);
+}
+
+const MemberFnTestFoo = struct {
+    x: i32,
+    fn member(foo: MemberFnTestFoo) i32 {
+        return foo.x;
+    }
+};
+test "store member function in variable" {
+    const instance = MemberFnTestFoo{ .x = 1234 };
+    const memberFn = MemberFnTestFoo.member;
+    const result = memberFn(instance);
+    try expect(result == 1234);
+}
+
 test "empty struct method call" {
     const es = EmptyStruct{};
     try expect(es.method() == 1234);
@@ -37,6 +77,13 @@ fn testReturnEmptyStructFromFn() EmptyStruct2 {
     return EmptyStruct2{};
 }
 
+test "pass slice of empty struct to fn" {
+    try expect(testPassSliceOfEmptyStructToFn(&[_]EmptyStruct2{EmptyStruct2{}}) == 1);
+}
+fn testPassSliceOfEmptyStructToFn(slice: []const EmptyStruct2) usize {
+    return slice.len;
+}
+
 const APackedStruct = packed struct {
     x: u8,
     y: u8,
@@ -285,6 +332,25 @@ fn alloc(comptime T: type) []T {
     return &[_]T{};
 }
 
+test "call method with mutable reference to struct with no fields" {
+    const S = struct {
+        fn doC(s: *const @This()) bool {
+            _ = s;
+            return true;
+        }
+        fn do(s: *@This()) bool {
+            _ = s;
+            return true;
+        }
+    };
+
+    var s = S{};
+    try expect(S.doC(&s));
+    try expect(s.doC());
+    try expect(S.do(&s));
+    try expect(s.do());
+}
+
 test "implicit cast packed struct field to const ptr" {
     const LevelUpMove = packed struct {
         move_id: u9,
@@ -384,6 +450,17 @@ test "packed struct with fp fields" {
     try expectEqual(@as(f32, 20.0), s.data[2]);
 }
 
+test "use within struct scope" {
+    const S = struct {
+        usingnamespace struct {
+            pub fn inner() i32 {
+                return 42;
+            }
+        };
+    };
+    try expectEqual(@as(i32, 42), S.inner());
+}
+
 test "default struct initialization fields" {
     const S = struct {
         a: i32 = 1234,
@@ -424,6 +501,41 @@ test "fn with C calling convention returns struct by value" {
     comptime try S.entry();
 }
 
+test "for loop over pointers to struct, getting field from struct pointer" {
+    const S = struct {
+        const Foo = struct {
+            name: []const u8,
+        };
+
+        var ok = true;
+
+        fn eql(a: []const u8) bool {
+            _ = a;
+            return true;
+        }
+
+        const ArrayList = struct {
+            fn toSlice(self: *ArrayList) []*Foo {
+                _ = self;
+                return @as([*]*Foo, undefined)[0..0];
+            }
+        };
+
+        fn doTheTest() !void {
+            var objects: ArrayList = undefined;
+
+            for (objects.toSlice()) |obj| {
+                if (eql(obj.name)) {
+                    ok = false;
+                }
+            }
+
+            try expect(ok);
+        }
+    };
+    try S.doTheTest();
+}
+
 test "zero-bit field in packed struct" {
     const S = packed struct {
         x: u10,
@@ -433,6 +545,24 @@ test "zero-bit field in packed struct" {
     _ = x;
 }
 
+test "struct field init with catch" {
+    const S = struct {
+        fn doTheTest() !void {
+            var x: anyerror!isize = 1;
+            var req = Foo{
+                .field = x catch undefined,
+            };
+            try expect(req.field == 1);
+        }
+
+        pub const Foo = extern struct {
+            field: isize,
+        };
+    };
+    try S.doTheTest();
+    comptime try S.doTheTest();
+}
+
 test "packed struct with non-ABI-aligned field" {
     const S = packed struct {
         x: u9,
@@ -587,6 +717,15 @@ test "anon struct literal field value initialized with fn call" {
     comptime try S.doTheTest();
 }
 
+test "self-referencing struct via array member" {
+    const T = struct {
+        children: [1]*@This(),
+    };
+    var x: T = undefined;
+    x = T{ .children = .{&x} };
+    try expect(x.children[0] == &x);
+}
+
 test "struct with union field" {
     const Value = struct {
         ref: u32 = 2,
diff --git a/test/behavior/usingnamespace.zig b/test/behavior/usingnamespace.zig
index ad47762c16..e819566002 100644
--- a/test/behavior/usingnamespace.zig
+++ b/test/behavior/usingnamespace.zig
@@ -1,5 +1,4 @@
 const std = @import("std");
-const expect = std.testing.expect;
 
 const A = struct {
     pub const B = bool;
@@ -12,42 +11,3 @@ const C = struct {
 test "basic usingnamespace" {
     try std.testing.expect(C.B == bool);
 }
-
-fn Foo(comptime T: type) type {
-    return struct {
-        usingnamespace T;
-    };
-}
-
-test "usingnamespace inside a generic struct" {
-    const std2 = Foo(std);
-    const testing2 = Foo(std.testing);
-    try std2.testing.expect(true);
-    try testing2.expect(true);
-}
-
-usingnamespace struct {
-    pub const foo = 42;
-};
-
-test "usingnamespace does not redeclare an imported variable" {
-    comptime try std.testing.expect(@This().foo == 42);
-}
-
-usingnamespace @import("usingnamespace/foo.zig");
-test "usingnamespace omits mixing in private functions" {
-    try expect(@This().privateFunction());
-    try expect(!@This().printText());
-}
-fn privateFunction() bool {
-    return true;
-}
-
-test {
-    _ = @import("usingnamespace/import_segregation.zig");
-}
-
-usingnamespace @import("usingnamespace/a.zig");
-test "two files usingnamespace import each other" {
-    try expect(@This().ok());
-}
diff --git a/test/behavior/usingnamespace_stage1.zig b/test/behavior/usingnamespace_stage1.zig
new file mode 100644
index 0000000000..142df21549
--- /dev/null
+++ b/test/behavior/usingnamespace_stage1.zig
@@ -0,0 +1,41 @@
+const std = @import("std");
+const expect = std.testing.expect;
+
+fn Foo(comptime T: type) type {
+    return struct {
+        usingnamespace T;
+    };
+}
+
+test "usingnamespace inside a generic struct" {
+    const std2 = Foo(std);
+    const testing2 = Foo(std.testing);
+    try std2.testing.expect(true);
+    try testing2.expect(true);
+}
+
+usingnamespace struct {
+    pub const foo = 42;
+};
+
+test "usingnamespace does not redeclare an imported variable" {
+    comptime try std.testing.expect(@This().foo == 42);
+}
+
+usingnamespace @import("usingnamespace/foo.zig");
+test "usingnamespace omits mixing in private functions" {
+    try expect(@This().privateFunction());
+    try expect(!@This().printText());
+}
+fn privateFunction() bool {
+    return true;
+}
+
+test {
+    _ = @import("usingnamespace/import_segregation.zig");
+}
+
+usingnamespace @import("usingnamespace/a.zig");
+test "two files usingnamespace import each other" {
+    try expect(@This().ok());
+}