tests/basics/lexer: Add a test for newline-escaping within a string.
diff --git a/py/lexer.c b/py/lexer.c
index c6ecdf1..7db49de 100644
--- a/py/lexer.c
+++ b/py/lexer.c
@@ -431,7 +431,7 @@
} else {
switch (c) {
case MP_LEXER_EOF: break; // TODO a proper error message?
- case '\n': c = MP_LEXER_EOF; break; // TODO check this works correctly (we are supposed to ignore it
+ case '\n': c = MP_LEXER_EOF; break; // backslash escape the newline, just ignore it
case '\\': break;
case '\'': break;
case '"': break;