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cmd/compile: don't panic when printing package-less symbols 

Some of the SSA pseudo-variables like the memory variable don't
have a package. Print those gracefully instead of printing a panic.

Fixes #51108

Change-Id: I5c29029356e045c5cf70909d6e63666ebc58ffaa
Reviewed-on: https://go-review.googlesource.com/c/go/+/384614
Trust: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Keith Randall 2022-02-09 11:42:54 -08:00
parent 21998413ad
commit d81464e1eb
1 changed files with 3 additions and 0 deletions
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3
src/cmd/compile/internal/types/fmt.go
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@ -157,6 +157,9 @@ func symfmt(b *bytes.Buffer, s *Sym, verb rune, mode fmtMode) {
// symbols from the given package in the given mode.
// If it returns the empty string, no qualification is needed.
func pkgqual(pkg *Pkg, verb rune, mode fmtMode) string {
if pkg == nil {
return ""
}
if verb != 'S' {
switch mode {
case fmtGo: // This is for the user