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, 2 insertions, 2 deletions

diff --git a/lib/std/pdb.zig b/lib/std/pdb.zig
index de0b8f3ec0..2b953aa5ac 100644
--- a/lib/std/pdb.zig
+++ b/lib/std/pdb.zig
@@ -115,7 +115,7 @@ pub const StreamType = enum(u16) {
 
 /// Duplicate copy of SymbolRecordKind, but using the official CV names. Useful
 /// for reference purposes and when dealing with unknown record types.
-pub const SymbolKind = packed enum(u16) {
+pub const SymbolKind = enum(u16) {
     S_COMPILE = 1,
     S_REGISTER_16t = 2,
     S_CONSTANT_16t = 3,
@@ -426,7 +426,7 @@ pub const FileChecksumEntryHeader = packed struct {
     ChecksumKind: u8,
 };
 
-pub const DebugSubsectionKind = packed enum(u32) {
+pub const DebugSubsectionKind = enum(u32) {
     None = 0,
     Symbols = 0xf1,
     Lines = 0xf2,