Add test for UNMATCHED PUSH

src/main.c

@@ -1215,7 +1215,7 @@ int DoBanner(ParsePtr p)
 	}
     }
     DBufFree(&Banner);
-    
+
     err = DBufPuts(&Banner, DBufValue(&buf));
     DBufFree(&buf);
     return err;

tests/test-rem

@@ -551,6 +551,21 @@ EOF
 
 ../src/remind ../tests/expr.rem >> ../tests/test.out 2>&1
 
+../src/remind -  <<'EOF' >> ../tests/test.out 2>&1
+PUSH
+POP
+PUSH
+PUSH
+POP
+POP
+PUSH
+PUSH
+POP
+PUSH
+POP
+PUSH
+POP
+EOF
 # Remove references to SysInclude, which is build-specific
 grep -F -v '$SysInclude' < ../tests/test.out > ../tests/test.out.1 && mv -f ../tests/test.out.1 ../tests/test.out
 cmp -s ../tests/test.out ../tests/test.cmp

tests/test.cmp

@@ -12346,3 +12346,6 @@ No reminders.
 Expression nodes high-water: 499
     Expression nodes leaked: 0
      Parse level high-water: 2001
+-stdin-(14): Unmatched PUSH-OMIT-CONTEXT at -(7)
+-stdin-(14): Warning: PUSH-OMIT-CONTEXT without matching POP-OMIT-CONTEXT
+No reminders.