check that the token type stack has been emptied of all but one term …

…(#657)
mthom · Aug 8, 2020 · c289646 · c289646
1 parent c43ba6f
commit c289646
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diff --git a/Cargo.toml b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "prolog_parser"
-version = "0.8.67"
+version = "0.8.68"
 authors = ["Mark Thom <[email protected]>"]
 repository = "https://github.com/mthom/prolog_parser"
 description = " An operator precedence parser for rusty-wam, an up and coming ISO Prolog implementation."

diff --git a/src/parser.rs b/src/parser.rs
@@ -952,7 +952,7 @@ impl<'a, R: Read> Parser<'a, R> {
 
         self.reduce_op(1400);
 
-        if self.terms.len() > 1 {
+        if self.terms.len() > 1 || self.stack.len() > 1 {
             return Err(ParserError::IncompleteReduction(self.lexer.line_num, self.lexer.col_num));
         }