File pr329-fix-detect-stdlib-modules.patch of Package go-licenses

From 2e99d4044f9acaef1a9375b5e2a7c6c634a6f3d3 Mon Sep 17 00:00:00 2001
From: Adam Connelly <adam.rpconnelly@gmail.com>
Date: Fri, 30 May 2025 15:18:02 +0100
Subject: [PATCH] fix: problem detecting stdlib modules when using toolchains

If the pkg.Module is `nil`, it's either part of the stdlib or it's not something that go-licenses can analyze correctly. Let's just skip modules like this instead of reporting an error.

The problem with the existing check is that it assumes that stdlib packages will have source files under `build.Default.GOROOT`. But if the module you're trying to analyze has a `toolchain` directive in its go.mod file that differs from the version of Go installed, the package will have a path outside of this directory.
---
 licenses/library.go | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/licenses/library.go b/licenses/library.go
index fa59120f..b26bcbd7 100644
--- a/licenses/library.go
+++ b/licenses/library.go
@@ -154,12 +154,6 @@ func Libraries(ctx context.Context, classifier Classifier, includeTests bool, ig
 				return true
 			}
 
-			if p.Module == nil {
-				otherErrorOccurred = true
-				klog.Errorf("Package %s does not have module info. Non go modules projects are no longer supported. For feedback, refer to https://github.com/google/go-licenses/issues/128.", p.PkgPath)
-				return false
-			}
-
 			module := newModule(p.Module)
 
 			if module.Dir == "" {
@@ -411,6 +405,10 @@ func (l *Library) Version() string {
 
 // isStdLib returns true if this package is part of the Go standard library.
 func isStdLib(pkg *packages.Package) bool {
+	if pkg.Module == nil {
+		return true
+	}
+
 	if pkg.Name == "unsafe" {
 		// Special case unsafe stdlib, because it does not contain go files.
 		return true