Minor fixes in lexer

lark/grammars/common.g

@@ -12,6 +12,7 @@ DECIMAL: INT "." INT? | "." INT
 // float = /-?\d+(\.\d+)?([eE][+-]?\d+)?/
 _EXP: ("e"|"E") SIGNED_INT
 FLOAT: INT _EXP | DECIMAL _EXP?
+SIGNED_FLOAT: ["+"|"-"] INT
 
 NUMBER: FLOAT | INT
 SIGNED_NUMBER: ["+"|"-"] NUMBER

lark/lexer.py

@@ -79,7 +79,7 @@ class _Lex:
 
     def lex(self, stream, newline_types, ignore_types):
         newline_types = list(newline_types)
-        newline_types = list(newline_types)
+        ignore_types = list(ignore_types)
         line_ctr = LineCounter()
 
         while True:
@@ -93,7 +93,7 @@ class _Lex:
                         t = Token(type_, value, line_ctr.char_pos, line_ctr.line, line_ctr.column)
                         if t.type in lexer.callback:
                             t = lexer.callback[t.type](t)
-                        lexer = yield t
+                        yield t
 
                     line_ctr.feed(value, type_ in newline_types)
                     break