do not get confused by local vars that alias names of library functions, and are used as function pointers

1 files changed, 30 insertions, 0 deletions

diff --git a/tests/runner.py b/tests/runner.py
index f9f46f10..de3c72de 100755
--- a/tests/runner.py
+++ b/tests/runner.py
@@ -3336,6 +3336,36 @@ Exiting setjmp function, level: 0, prev_jmp: -1
       '''
       self.do_run(src, '*0x1*')
 
+    def test_funcptr_namecollide(self):
+      src = r'''
+        #include <stdio.h>
+
+        void do_call(void (*puts)(const char *), const char *str);
+
+        void do_print(const char *str) {
+          if (!str) do_call(NULL, "delusion");
+          if ((int)str == -1) do_print(str+10);
+          puts("====");
+          puts(str);
+          puts("====");
+        }
+
+        void do_call(void (*puts)(const char *), const char *str) {
+          if (!str) do_print("confusion");
+          if ((int)str == -1) do_call(NULL, str-10);
+          (*puts)(str);
+        }
+
+        int main(int argc, char **argv)
+        {
+          for (int i = 0; i < argc; i++) {
+            do_call(i != 10 ? do_print : NULL, i != 15 ? "waka waka" : NULL);
+          }
+          return 0;
+        }
+      '''
+      self.do_run(src, 'waka', force_c=True)
+
     def test_emptyclass(self):
         if self.emcc_args is None: return self.skip('requires emcc')
         src = '''