1 files changed, 9 insertions(+), 5 deletions(-)

M src/parse.rs

@@ 278,12 278,16 @@ fn end<'s: 't, 't>(inp: Inp<'s, 't>) -> Res<'s, 't, ()> {
 
 fn alt2<'s: 't, 't, A>(mut f: impl Parser<'s, 't, A>, mut g: impl Parser<'s, 't, A>) -> impl Parser<'s, 't, A> {
     move |inp| {
+        let dist0 = inp.dist;
         f(inp.clone()).or_else(|e1| {
-            use std::cmp::Ordering::*;
-            g(inp).map_err(|e2| match e1.dist.cmp(&e2.dist) {
-                Greater => e1,
-                Less => e2,
-                Equal => ParseErr { expecteds: e1.expecteds.union(&e2.expecteds).cloned().collect(), ..e2 },
+            if e1.dist > dist0 {
+                return Err(e1);
+            }
+            g(inp).map_err(|e2| {
+                if e2.dist > dist0 {
+                    return e2;
+                }
+                ParseErr { expecteds: e1.expecteds.union(&e2.expecteds).cloned().collect(), ..e2 }
             })
         })
     }