`@sizeOf` returns 0 for comptime types

This defines `@sizeOf` to be the runtime size of a type, which means
that it is zero for types such as comptime_int, type, and (enum
literal).

See #2209

1 files changed, 9 insertions, 0 deletions

diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index 0d30bd7175..60d1a9ac89 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -3,6 +3,15 @@ const builtin = @import("builtin");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
     cases.add(
+        "@sizeOf bad type",
+        \\export fn entry() void {
+        \\    _ = @sizeOf(@typeOf(null));
+        \\}
+    ,
+        "tmp.zig:2:17: error: no size available for type '(null)'",
+    );
+
+    cases.add(
         "Generic function where return type is self-referenced",
         \\fn Foo(comptime T: type) Foo(T) {
         \\    return struct{ x: T };