Fix interop behavior: object with 'KEYS' is not a mapping.

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/objects/foreign/TruffleObjectBuiltins.java

@@ -504,6 +504,13 @@ protected boolean isForeignArray(TruffleObject receiver) {
 
         protected boolean isForeignMapping(TruffleObject receiver) {
             if (PGuards.isForeignObject(receiver)) {
+                if (hasSizeNode == null) {
+                    CompilerDirectives.transferToInterpreterAndInvalidate();
+                    hasSizeNode = insert(Message.HAS_SIZE.createNode());
+                }
+                if (!ForeignAccess.sendHasSize(hasSizeNode, receiver)) {
+                    return false;
+                }
                 if (hasKeysNode == null) {
                     CompilerDirectives.transferToInterpreterAndInvalidate();
                     hasKeysNode = insert(Message.HAS_KEYS.createNode());

graalpython/lib-graalpython/_sre.py

@@ -108,7 +108,8 @@ def __group__(self, idx):
 
     def groupdict(self, default=None):
         d = {}
-        for k in self.compiled_regex.groups:
+        assert _interop.__has_keys__(self.compiled_regex.groups)
+        for k in _interop.__keys__(self.compiled_regex.groups):
             idx = self.compiled_regex.groups[k]
             d[k] = self.__group__(idx)
         return d