Fix oneOf() to reset input cursor after each parser execution

smnp/ast/parser.py

@@ -69,6 +69,7 @@ class Parser:
                 value = parser(input)
                 if value.result:
                     return value
+                input.reset(snap)
 
             if assertExpected is not None:
                 found = f", found '{input.current().rawValue}'" if input.hasCurrent() else ""
@@ -80,7 +81,6 @@ class Parser:
                 else:
                     raise exception
 
-
             input.reset(snap)
             return ParseResult.FAIL()