correct sign/1 (#216)

2019-10-27 14:18:32 -06:00
parent 67a00e4deb
commit 0dcd9e5805
2 changed files with 4 additions and 3 deletions
--- a/src/prolog/heap_print.rs
+++ b/src/prolog/heap_print.rs
@@ -329,7 +329,8 @@ pub fn requires_space(atom: &str, op: &str) -> bool {
            .next()
            .map(|oc| {
                if ac == '0' {
-                    oc == 'b' || oc == 'x' || oc == 'o' || oc == '\'' || alpha_numeric_char!(oc)
+                    oc == 'b' || oc == 'x' || oc == 'o' || oc == '\''
+                 || oc == '(' || alpha_numeric_char!(oc)
                } else if alpha_numeric_char!(ac) {
                    oc == '(' || alpha_numeric_char!(oc)
                } else if graphic_token_char!(ac) {