interp: fix generic check on nil function

Related to issue traefik/traefik#9231
traefik · Aug 5, 2022 · ae725fb · ae725fb
1 parent 14bc3b5
commit ae725fb
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Showing 2 changed files with 13 additions and 1 deletion.
diff --git a/_test/gen10.go b/_test/gen10.go
@@ -0,0 +1,12 @@
+package main
+
+func genFunc() (f func()) {
+	return f
+}
+
+func main() {
+	println(genFunc() == nil)
+}
+
+// Output:
+// true
diff --git a/interp/type.go b/interp/type.go
@@ -2213,7 +2213,7 @@ func isEmptyInterface(t *itype) bool {
 }
 
 func isGeneric(t *itype) bool {
-	return t.cat == funcT && t.node != nil && len(t.node.child[0].child) > 0
+	return t.cat == funcT && t.node != nil && len(t.node.child) > 0 && len(t.node.child[0].child) > 0
 }
 
 func isFuncSrc(t *itype) bool {