`@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, 4 insertions, 0 deletions

diff --git a/doc/langref.html.in b/doc/langref.html.in
index 7217d4786e..7b3d7f3dd1 100644
--- a/doc/langref.html.in
+++ b/doc/langref.html.in
@@ -7275,6 +7275,10 @@ test "@setRuntimeSafety" {
       consider whether you want to use {#syntax#}@sizeOf(T){#endsyntax#} or
       {#syntax#}@typeInfo(T).Int.bits{#endsyntax#}.
       </p>
+      <p>
+      This function measures the size at runtime. For types that are disallowed at runtime, such as
+      {#syntax#}comptime_int{#endsyntax#} and {#syntax#}type{#endsyntax#}, the result is {#syntax#}0{#endsyntax#}.
+      </p>
       {#see_also|@typeInfo#}
       {#header_close#}