Fix lint error and add additional tests

packages/malloy/src/lang/syntax-errors/custom-error-messages.ts

@@ -120,11 +120,10 @@ const checkTokenSequenceMatch = (
           anchorTokenPosition + tokenOffset
         ).type;
       } else {
+        // Note: positive lookahead starts at '2' because '1' is the current token.
         const tokenOffset = direction === 'lookahead' ? i + 2 : -1 * (i + 1);
         streamToken = parser.inputStream.LA(tokenOffset);
       }
-      // Note: positive lookahead starts at '2' because '1' is the current token.
-
 
       // Note: negative checking is < -1 becuase Token.EOF is -1, but below
       // that we use negatives to indicate "does-not-match" rules.

packages/malloy/src/lang/test/syntax-errors.spec.ts

@@ -97,4 +97,14 @@ describe('errors', () => {
       )
     );
   });
+  test('run opening curly to EOF', () => {
+    expect(`
+        run: x -> {
+      `).toLogAtLeast(errorMessage("Missing '}' at '<EOF>'"));
+  });
+  test('source opening curly to EOF', () => {
+    expect(`
+        source: y is x extend {
+      `).toLogAtLeast(errorMessage("Missing '}' at '<EOF>'"));
+  });
 });