diff --git a/spec/generated-parser.spec.js b/spec/generated-parser.spec.js
index 316efe8..aac6e8b 100644
--- a/spec/generated-parser.spec.js
+++ b/spec/generated-parser.spec.js
@@ -91,6 +91,65 @@ describe("generated parser", function() {
     });
   });
 
+  describe("semantic not code", function() {
+    varyAll(function(options) {
+      it("causes successful match by returning |false|", function() {
+        var parser = PEG.buildParser('start = !{ return false; }', options);
+
+        expect(parser).toParse("", "");
+      });
+
+      it("causes match failure by returning |true|", function() {
+        var parser = PEG.buildParser('start = !{ return true; }', options);
+
+        expect(parser).toFailToParse();
+      });
+
+      it("can use label variables", function() {
+        var parser = PEG.buildParser(
+              'start = a:"a" !{ return a !== "a"; }',
+              options
+            );
+
+        expect(parser).toParse("a", ["a", ""]);
+      });
+
+      it("can use the |offset| variable to get the current parse position", function() {
+        var parser = PEG.buildParser(
+              'start = "a" !{ return offset !== 1; }',
+              options
+            );
+
+        expect(parser).toParse("a", ["a", ""]);
+      });
+
+      if (options.trackLineAndColumn) {
+        it("can use the |line| and |column| variables to get the current line and column", function() {
+          var parser = PEG.buildParser([
+                '{ var result; }',
+                'start  = line (nl+ line)* { return result; }',
+                'line   = thing (" "+ thing)*',
+                'thing  = digit / mark',
+                'digit  = [0-9]',
+                'mark   = !{ result = [line, column]; return false; } "x"',
+                'nl     = ("\\r" / "\\n" / "\\u2028" / "\\u2029")'
+              ].join("\n"), options);
+
+          expect(parser).toParse("1\n2\n\n3\n\n\n4 5 x", [7, 5]);
+
+          /* Non-Unix newlines */
+          expect(parser).toParse("1\rx",   [2, 1]); // Old Mac
+          expect(parser).toParse("1\r\nx", [2, 1]); // Windows
+          expect(parser).toParse("1\n\rx", [3, 1]); // mismatched
+
+          /* Strange newlines */
+          expect(parser).toParse("1\u2028x", [2, 1]); // line separator
+          expect(parser).toParse("1\u2029x", [2, 1]); // paragraph separator
+        });
+      }
+    });
+  });
+
   describe("optional matching", function() {
     varyAll(function(options) {
       it("matches correctly", function() {
diff --git a/test/compiler-test.js b/test/compiler-test.js
index 0cf4c9c..f6cec8d 100644
--- a/test/compiler-test.js
+++ b/test/compiler-test.js
@@ -251,184 +251,6 @@ test("semantic and (with trackLineAndColumn: true)", function() {
   parses(digitsParser, "1\u2029x", [2, 1]); // paragraph separator
 });
 
-test("semantic not (with trackLineAndColumn: false)", function() {
-  var options = { trackLineAndColumn: false };
-
-  var acceptingParser = PEG.buildParser(
-    'start = "a" !{ return false; } "b"',
-    options
-  );
-  parses(acceptingParser, "ab", ["a", "", "b"]);
-
-  var rejectingParser = PEG.buildParser(
-    'start = "a" !{ return true; } "b"',
-    options
-  );
-  doesNotParse(rejectingParser, "ab");
-
-  var singleElementUnlabeledParser = PEG.buildParser(
-    'start = "a" !{ return arguments.length !== 1 || offset !== 1; }',
-    options
-  );
-  parses(singleElementUnlabeledParser, "a", ["a", ""]);
-
-  var singleElementLabeledParser = PEG.buildParser([
-    'start = a:"a" !{',
-    '          return arguments.length !== 2',
-    '            || offset !== 1',
-    '            || a !== "a";',
-    '        }'
-  ].join("\n"), options);
-  parses(singleElementLabeledParser, "a", ["a", ""]);
-
-  var multiElementUnlabeledParser = PEG.buildParser(
-    'start = "a" "b" "c" !{ return arguments.length !== 1 || offset !== 3; }',
-    options
-  );
-  parses(multiElementUnlabeledParser, "abc", ["a", "b", "c", ""]);
-
-  var multiElementLabeledParser = PEG.buildParser([
-    'start = a:"a" "b" c:"c" !{',
-    '          return arguments.length !== 3',
-    '            || offset !== 3',
-    '            || a !== "a"',
-    '            || c !== "c";',
-    '        }'
-  ].join("\n"), options);
-  parses(multiElementLabeledParser, "abc", ["a", "b", "c", ""]);
-
-  var innerElementsUnlabeledParser = PEG.buildParser([
-    'start = "a"',
-    '        ("b" "c" "d" !{ return arguments.length !== 1 || offset !== 4; })',
-    '        "e"'
-  ].join("\n"), options);
-  parses(innerElementsUnlabeledParser, "abcde", ["a", ["b", "c", "d", ""], "e"]);
-
-  var innerElementsLabeledParser = PEG.buildParser([
-    'start = "a"',
-    '        (',
-    '          b:"b" "c" d:"d" !{',
-    '            return arguments.length !== 3',
-    '              || offset !== 4',
-    '              || b !== "b"',
-    '              || d !== "d";',
-    '          }',
-    '        )',
-    '        "e"'
-  ].join("\n"), options);
-  parses(innerElementsLabeledParser, "abcde", ["a", ["b", "c", "d", ""], "e"]);
-});
-
-test("semantic not (with trackLineAndColumn: true)", function() {
-  var options = { trackLineAndColumn: true };
-
-  var acceptingParser = PEG.buildParser(
-    'start = "a" !{ return false; } "b"',
-    options
-  );
-  parses(acceptingParser, "ab", ["a", "", "b"]);
-
-  var rejectingParser = PEG.buildParser(
-    'start = "a" !{ return true; } "b"',
-    options
-  );
-  doesNotParse(rejectingParser, "ab");
-
-  var singleElementUnlabeledParser = PEG.buildParser([
-    'start = "a" !{',
-    '          return arguments.length !== 3',
-    '            || offset !== 1',
-    '            || line !== 1',
-    '            || column !== 2;',
-    '        }'
-  ].join("\n"), options);
-  parses(singleElementUnlabeledParser, "a", ["a", ""]);
-
-  var singleElementLabeledParser = PEG.buildParser([
-    'start = a:"a" !{',
-    '          return arguments.length !== 4',
-    '            || offset !== 1',
-    '            || line !== 1',
-    '            || column !== 2',
-    '            || a !== "a";',
-    '        }'
-  ].join("\n"), options);
-  parses(singleElementLabeledParser, "a", ["a", ""]);
-
-  var multiElementUnlabeledParser = PEG.buildParser([
-    'start = "a" "b" "c" !{',
-    '          return arguments.length !== 3',
-    '            || offset !== 3',
-    '            || line !== 1',
-    '            || column !== 4;',
-    '        }'
-  ].join("\n"), options);
-  parses(multiElementUnlabeledParser, "abc", ["a", "b", "c", ""]);
-
-  var multiElementLabeledParser = PEG.buildParser([
-    'start = a:"a" "b" c:"c" !{',
-    '          return arguments.length !== 5',
-    '            || offset !== 3',
-    '            || line !== 1',
-    '            || column !== 4',
-    '            || a !== "a"',
-    '            || c !== "c";',
-    '        }'
-  ].join("\n"), options);
-  parses(multiElementLabeledParser, "abc", ["a", "b", "c", ""]);
-
-  var innerElementsUnlabeledParser = PEG.buildParser([
-    'start = "a"',
-    '        (',
-    '          "b" "c" "d" !{',
-    '            return arguments.length !== 3',
-    '              || offset !== 4',
-    '              || line !== 1',
-    '              || column !== 5;',
-    '           }',
-    '        )',
-    '        "e"'
-  ].join("\n"), options);
-  parses(innerElementsUnlabeledParser, "abcde", ["a", ["b", "c", "d", ""], "e"]);
-
-  var innerElementsLabeledParser = PEG.buildParser([
-    'start = "a"',
-    '        (',
-    '          b:"b" "c" d:"d" !{',
-    '            return arguments.length !== 5',
-    '              || offset !== 4',
-    '              || line !== 1',
-    '              || column !== 5',
-    '              || b !== "b"',
-    '              || d !== "d";',
-    '          }',
-    '        )',
-    '        "e"'
-  ].join("\n"), options);
-  parses(innerElementsLabeledParser, "abcde", ["a", ["b", "c", "d", ""], "e"]);
-
-  var digitsParser = PEG.buildParser([
-    '{ var result; }',
-    'start  = line (nl+ line)* { return result; }',
-    'line   = thing (" "+ thing)*',
-    'thing  = digit / mark',
-    'digit  = [0-9]',
-    'mark   = !{ result = [line, column]; return false; } "x"',
-    'nl     = ("\\r" / "\\n" / "\\u2028" / "\\u2029")'
-  ].join("\n"), options);
-
-  parses(digitsParser, "1\n2\n\n3\n\n\n4 5 x", [7, 5]);
-
-  /* Non-Unix newlines */
-  parses(digitsParser, "1\rx", [2, 1]);   // Old Mac
-  parses(digitsParser, "1\r\nx", [2, 1]); // Windows
-  parses(digitsParser, "1\n\rx", [3, 1]); // mismatched
-
-  /* Strange newlines */
-  parses(digitsParser, "1\u2028x", [2, 1]); // line separator
-  parses(digitsParser, "1\u2029x", [2, 1]); // paragraph separator
-});
-
 testWithVaryingTrackLineAndColumn("initializer", function(options) {
   var variableInActionParser = PEG.buildParser(
     '{ a = 42; }; start = "a" { return a; }',