better error messages

jd-develop · Oct 4, 2024 · f52824f · f52824f
1 parent bf0ec3f
commit f52824f
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -23,6 +23,7 @@ to str)
 (does not change anything to public API)
 * Optimised asserts a little bit
 * Fixed bug where identifiers after `$` could start with digits
+* Better error messages
 
 #### Build scripts
 * Build scripts now copy `CHANGELOG.md`.

diff --git a/src/lexer/lexer.py b/src/lexer/lexer.py
@@ -861,10 +861,13 @@ def make_less_than(self):
                 self.advance()
                 token_type = TT["LTEQ"]
             else:
+                current_char_user_friendly = f"'{new_char}'"
+                if new_char is None:
+                    current_char_user_friendly = "(end of file)"
                 return None, InvalidSyntaxError(
                     pos_start,
                     self.pos,
-                    f"expected '=' after '<<', got '{self.current_char}'.",
+                    f"expected '=' after '<<', got {current_char_user_friendly}.",
                     "src.lexer.lexer.Lexer.make_less_than"
                 )
         elif self.current_char == "d" and self.next_char(7) == "efault>":  # <default>