Windows: Fix incorrect output when .pdb file is not found during stack trace

This `pdb.Pdb.init` call can return `error.FileNotFound`, which was previously resulting in:

    Unable to print stack trace: FileNotFound

which also aborts the stack trace printing (so any deeper stack traces are not printed).

It makes more sense to treat it as `MissingDebugInfo` which then gets printed as:

    ???:?:?: 0x7fffa8817033 in ??? (???)

and allows the stack trace to continue printing.

Note: locally, the error.FileNotFound was being triggered for me when looking for kernel32.pdb and ntdll.pdb

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/std/debug.zig b/lib/std/debug.zig
index 3ce9f3c1d3..5e217890b7 100644
--- a/lib/std/debug.zig
+++ b/lib/std/debug.zig
@@ -864,7 +864,10 @@ fn readCoffDebugInfo(allocator: mem.Allocator, coff_file: File) !ModuleDebugInfo
         defer allocator.free(path);
 
         di.debug_data = PdbOrDwarf{ .pdb = undefined };
-        di.debug_data.pdb = try pdb.Pdb.init(allocator, path);
+        di.debug_data.pdb = pdb.Pdb.init(allocator, path) catch |err| switch (err) {
+            error.FileNotFound, error.IsDir => return error.MissingDebugInfo,
+            else => return err,
+        };
         try di.debug_data.pdb.parseInfoStream();
         try di.debug_data.pdb.parseDbiStream();