Handle params better for extract variable

test/refactor/extract_variable.py

@@ -16,6 +16,13 @@ def test():
     #? 25 text {'new_name': 'a'}
     a = 30 + b
     return test(100, (a, c) + 1)
+# -------------------------------------------------- simple-3
+#? 13 text {'new_name': 'zzx.x'}
+test(100, {1  |1: 2 + 3})
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+#? 13 text {'new_name': 'zzx.x'}
+zzx.x = 1  |1
+test(100, {zzx.x: 2 + 3})
 # -------------------------------------------------- multiline-1
 def test():
     #? 30 text {'new_name': 'x'}
@@ -38,3 +45,24 @@ def test():
     x = 30 + b
     return test(1, (x, c) 
                             + 1)
+# -------------------------------------------------- for-param-error-1
+#? 10 error {'new_name': 'x'}
+def test(p1):
+    return
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+Cannot extract a definition of a name
+# -------------------------------------------------- for-param-error-2
+#? 12 error {'new_name': 'x'}
+def test(p1= 3):
+    return
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+Cannot extract a param
+# -------------------------------------------------- for-param-1
+#? 12 text {'new_name': 'x'}
+def test(p1=20):
+    return
+# ++++++++++++++++++++++++++++++++++++++++++++++++++
+#? 12 text {'new_name': 'x'}
+x = 20
+def test(p1=x):
+    return