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, 3 insertions, 1 deletions

diff --git a/src/AstGen.zig b/src/AstGen.zig
index 1080506192..2d34a938a7 100644
--- a/src/AstGen.zig
+++ b/src/AstGen.zig
@@ -2658,7 +2658,9 @@ fn fnDecl(
             var i: usize = 0;
             var it = fn_proto.iterate(tree.*);
             while (it.next()) |param| : (i += 1) {
-                const name_token = param.name_token.?;
+                const name_token = param.name_token orelse {
+                    return astgen.failNode(param.type_expr, "missing parameter name", .{});
+                };
                 const param_name = try astgen.identifierTokenString(name_token);
                 const sub_scope = try astgen.arena.create(Scope.LocalVal);
                 sub_scope.* = .{