Fix a shadow-compatible-local warning (#2182)

Change the shadowing naming, 'value' (Python-ast.c:3814), to 'val' to prevent the variables from being misused.

Author: OswinC

Parser/asdl_c.py

@@ -509,8 +509,8 @@ def visitField(self, field, name, sum=None, prod=None, depth=0):
  self.emit("%s = asdl_seq_new(len, arena);" % field.name, depth+1)
  self.emit("if (%s == NULL) goto failed;" % field.name, depth+1)
  self.emit("for (i = 0; i < len; i++) {", depth+1)
- self.emit("%s value;" % ctype, depth+2)
- self.emit("res = obj2ast_%s(PyList_GET_ITEM(tmp, i), &value, arena);" %
+ self.emit("%s val;" % ctype, depth+2)
+ self.emit("res = obj2ast_%s(PyList_GET_ITEM(tmp, i), &val, arena);" %
  field.type, depth+2, reflow=False)
  self.emit("if (res != 0) goto failed;", depth+2)
  self.emit("if (len != PyList_GET_SIZE(tmp)) {", depth+2)
@@ -520,7 +520,7 @@ def visitField(self, field, name, sum=None, prod=None, depth=0):
  depth+3, reflow=False)
  self.emit("goto failed;", depth+3)
  self.emit("}", depth+2)
- self.emit("asdl_seq_SET(%s, i, value);" % field.name, depth+2)
+ self.emit("asdl_seq_SET(%s, i, val);" % field.name, depth+2)
  self.emit("}", depth+1)
  else:
  self.emit("res = obj2ast_%s(tmp, &%s, arena);" %