diff --git a/test/behavior/basic.zig b/test/behavior/basic.zig
index b82bfab99e..669cacfc40 100644
--- a/test/behavior/basic.zig
+++ b/test/behavior/basic.zig
@@ -1143,3 +1143,17 @@ test "orelse coercion as function argument" {
     var foo = Container.init(optional orelse .{});
     try expect(foo.a.?.start == -1);
 }
+
+test "runtime-known globals initialized with undefined" {
+    const S = struct {
+        var array: [10]u32 = [_]u32{ 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
+        var vp: [*]u32 = undefined;
+        var s: []u32 = undefined;
+    };
+
+    S.vp = &S.array;
+    S.s = S.vp[0..5];
+
+    try expect(S.s[0] == 1);
+    try expect(S.s[4] == 5);
+}
diff --git a/test/behavior/cast.zig b/test/behavior/cast.zig
index 16f3c6e2dd..927caa965b 100644
--- a/test/behavior/cast.zig
+++ b/test/behavior/cast.zig
@@ -1568,3 +1568,12 @@ test "@volatileCast without a result location" {
     try expect(@TypeOf(z) == *i32);
     try expect(z.* == 1234);
 }
+
+test "coercion from single-item pointer to @as to slice" {
+    var x: u32 = 1;
+
+    // Why the following line gets a compile error?
+    const t: []u32 = @as(*[1]u32, &x);
+
+    try expect(t[0] == 1);
+}
diff --git a/test/behavior/struct.zig b/test/behavior/struct.zig
index ed3e1ce88f..8a01d68587 100644
--- a/test/behavior/struct.zig
+++ b/test/behavior/struct.zig
@@ -1578,3 +1578,38 @@ test "directly initiating tuple like struct" {
     const a = struct { u8 }{8};
     try expect(a[0] == 8);
 }
+
+test "instantiate struct with comptime field" {
+    {
+        var things = struct {
+            comptime foo: i8 = 1,
+        }{};
+
+        comptime std.debug.assert(things.foo == 1);
+    }
+
+    {
+        const T = struct {
+            comptime foo: i8 = 1,
+        };
+        var things = T{};
+
+        comptime std.debug.assert(things.foo == 1);
+    }
+
+    {
+        var things: struct {
+            comptime foo: i8 = 1,
+        } = .{};
+
+        comptime std.debug.assert(things.foo == 1);
+    }
+
+    {
+        var things: struct {
+            comptime foo: i8 = 1,
+        } = undefined; // Segmentation fault at address 0x0
+
+        comptime std.debug.assert(things.foo == 1);
+    }
+}
diff --git a/test/behavior/type_info.zig b/test/behavior/type_info.zig
index 419a2f231c..6f64c92006 100644
--- a/test/behavior/type_info.zig
+++ b/test/behavior/type_info.zig
@@ -603,3 +603,9 @@ test "@typeInfo decls ignore dependency loops" {
     };
     _ = S.foo;
 }
+
+test "type info of tuple of string literal default value" {
+    const struct_field = @typeInfo(@TypeOf(.{"hi"})).Struct.fields[0];
+    const value = @ptrCast(*align(1) const *const [2:0]u8, struct_field.default_value.?).*;
+    comptime std.debug.assert(value[0] == 'h');
+}
diff --git a/test/cases/compile_errors/error_set_membership.zig b/test/cases/compile_errors/error_set_membership.zig
new file mode 100644
index 0000000000..5683e9594b
--- /dev/null
+++ b/test/cases/compile_errors/error_set_membership.zig
@@ -0,0 +1,31 @@
+const std = @import("std");
+
+const Error = error{InvalidCharacter};
+
+const Direction = enum { upside_down };
+
+const Barrrr = union(enum) {
+    float: f64,
+    direction: Direction,
+};
+
+fn fooey(bar: std.meta.Tag(Barrrr), args: []const []const u8) !Barrrr {
+    return switch (bar) {
+        .float => .{ .float = try std.fmt.parseFloat(f64, args[0]) },
+        .direction => if (std.mem.eql(u8, args[0], "upside_down"))
+            Barrrr{ .direction = .upside_down }
+        else
+            error.InvalidDirection,
+    };
+}
+
+pub fn main() Error!void {
+    std.debug.print("{}", .{try fooey(.direction, &[_][]const u8{ "one", "two", "three" })});
+}
+
+// error
+// backend=llvm
+// target=native
+//
+// :23:29: error: expected type 'error{InvalidCharacter}', found '@typeInfo(@typeInfo(@TypeOf(tmp.fooey)).Fn.return_type.?).ErrorUnion.error_set'
+// :23:29: note: 'error.InvalidDirection' not a member of destination error set