std: fix compile errors caught by stage2 AstGen

 * `comptime const` is redundant
 * don't use `extern enum`; specify a tag type.
   `extern enum` is only when you need tags to alias. But aliasing tags
   is a smell. I will be making a proposal shortly to remove `extern enum`
   from the language.
 * there is no such thing as `packed enum`.
 * instead of `catch |_|`, omit the capture entirely.
 * unused function definition with missing parameter name
 * using `try` outside of a function or test

1 files changed, 0 insertions, 4 deletions

diff --git a/lib/std/meta.zig b/lib/std/meta.zig
index ff2e6fb226..a67e04431a 100644
--- a/lib/std/meta.zig
+++ b/lib/std/meta.zig
@@ -335,9 +335,6 @@ test "std.meta.containerLayout" {
     const E1 = enum {
         A,
     };
-    const E2 = packed enum {
-        A,
-    };
     const E3 = extern enum {
         A,
     };
@@ -355,7 +352,6 @@ test "std.meta.containerLayout" {
     };
 
     testing.expect(containerLayout(E1) == .Auto);
-    testing.expect(containerLayout(E2) == .Packed);
     testing.expect(containerLayout(E3) == .Extern);
     testing.expect(containerLayout(S1) == .Auto);
     testing.expect(containerLayout(S2) == .Packed);