Merge pull request RustPython#1748 from youknowone/syntax-error

Fix SyntaxError initial value

Author: youknowone

tests/snippets/exceptions.py

@@ -65,3 +65,11 @@ def __init__(self, value):
 	raise NewException("test")
 except NewException as e:
 	assert e.value == "test"
+
+
+exc = SyntaxError('msg', 1, 2, 3, 4, 5)
+assert exc.msg == 'msg'
+assert exc.filename is None
+assert exc.lineno is None
+assert exc.offset is None
+assert exc.text is None

vm/src/exceptions.rs

@@ -645,6 +645,11 @@ pub fn init(ctx: &PyContext) {
 
     extend_class!(ctx, &excs.syntax_error, {
         "msg" => ctx.new_readonly_getset("msg", make_arg_getter(0)),
+        // TODO: members
+        "filename" => ctx.none(),
+        "lineno" => ctx.none(),
+        "offset" => ctx.none(),
+        "text" => ctx.none(),
     });
 
     extend_class!(ctx, &excs.import_error, {