throw error if unicode_escape_encode param is no str

Author: timfel

graalpython/lib-graalpython/_codecs.py

@@ -247,6 +247,8 @@ def utf_32_ex_decode(data, errors=None, byteorder=0, final=False):
 
 @__builtin__
 def unicode_escape_encode(string, errors=None):
+    if not isinstance(string, str):
+        raise TypeError("unicode_escape_encode() argument 1 must be str, not %s", type(string))
     return __truffle_encode(repr(string)[1:-1], "latin-1", errors)