better detect syntax errors in lexer.rs (#1771)

2023-06-27 16:39:10 -06:00
parent 8613513b9c
commit 039fffb339
2 changed files with 8 additions and 1 deletions
--- a/src/lib/charsio.pl
+++ b/src/lib/charsio.pl
@@ -193,6 +193,7 @@ get_single_char(C) :-
 % ```
 read_from_chars(Chars, Term) :-
    must_be(chars, Chars),
+    must_be(var, Term),
    '$read_term_from_chars'(Chars, Term).

 %% write_term_to_chars(+Term, +Options, -Chars).