From 5264b687df7433b8cff244c0ddb20a2efa1013ad Mon Sep 17 00:00:00 2001
From: Hood Chatham <hood@mit.edu>
Date: Fri, 30 Jul 2021 16:55:13 +0200
Subject: [PATCH] ENH Improve PyodideConsole error messages (#1759)

when code causes a lexer error
---
 src/py/_pyodide/console.py | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/py/_pyodide/console.py b/src/py/_pyodide/console.py
index 962aa1eb3..1ec34e970 100644
--- a/src/py/_pyodide/console.py
+++ b/src/py/_pyodide/console.py
@@ -12,6 +12,7 @@ from contextlib import _RedirectStream  # type: ignore
 import rlcompleter
 import platform
 import sys
+from tokenize import TokenError
 import traceback
 from typing import Literal
 from typing import (
@@ -97,8 +98,13 @@ class _Compile(Compile):
 
     def __call__(self, source, filename, symbol) -> CodeRunner:  # type: ignore
         return_mode = self.return_mode
-        if self.quiet_trailing_semicolon and should_quiet(source):
-            return_mode = None
+        try:
+            if self.quiet_trailing_semicolon and should_quiet(source):
+                return_mode = None
+        except (TokenError, SyntaxError):
+            # Invalid code, let the Python parser throw the error later.
+            pass
+
         code_runner = CodeRunner(
             source,
             mode=symbol,