ast/filter.go: missing nil-check causes crash

R=rsc CC=golang-dev https://golang.org/cl/461041

ast/filter.go: missing nil-check causes crash
R=rsc CC=golang-dev https://golang.org/cl/461041
f7c27b9a · Robert Griesemer · 3e24f2d6 · f7c27b9a
Commit f7c27b9a authored Mar 12, 2010 by Robert Griesemer
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filter.go src/pkg/go/ast/filter.go +1 -1

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--- a/src/pkg/go/ast/filter.go
+++ b/src/pkg/go/ast/filter.go
@@ -293,7 +293,7 @@ func MergePackageFiles(pkg *Package, complete bool) *File {
 						name := f.Name.Name()
 						if j, exists := funcs[name]; exists {
 							// function declared already
-							if decls[j].(*FuncDecl).Doc == nil {
+							if decls[j] != nil && decls[j].(*FuncDecl).Doc == nil {
 								// existing declaration has no documentation;
 								// ignore the existing declaration
 								decls[j] = nil