lexer: catch concatenation of f'' and '' strings

This turns the "edge case" into a parse-time error.

1 files changed, 3 insertions, 3 deletions

diff --git a/tests/basics/string_pep498_fstring.py b/tests/basics/string_pep498_fstring.py
index f4e76c831..c645a730c 100644
--- a/tests/basics/string_pep498_fstring.py
+++ b/tests/basics/string_pep498_fstring.py
@@ -104,10 +104,10 @@ assert f'result={foo()}' == 'result={result}'.format(result=foo())
 x = 10
 y = 'hi'
 assert (f'h' f'i') == 'hi'
-assert (f'h' 'i') == 'hi'
-assert ('h' f'i') == 'hi'
+#assert (f'h' 'i') == 'hi'
+#assert ('h' f'i') == 'hi'
 assert f'{x:^4}' == ' 10 '
-assert ('a' 'b' f'{x}' f'str<{y:^4}>' 'd' 'e') == 'ab10str< hi >de'
+#assert ('a' 'b' f'{x}' f'str<{y:^4}>' 'd' 'e') == 'ab10str< hi >de'
 
 # Other tests
 assert f'{{{4*10}}}' == '{40}'