Fix incorrect FIXME.

The case that we wanted to write a test for cannot happen, as the
UnwrappedLineParser already protects against it. Added an assert to
prevent regressions of that assumption.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171720 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Format/UnwrappedLineParser.cpp

@@ -41,8 +41,9 @@ public:
   }
 
   virtual FormatToken getNextToken() {
-    // FIXME: Write test that breaks due to a missing
-    // if (eof()) return createEOF();
+    // The \c UnwrappedLineParser guards against this by never calling
+    // \c getNextToken() after it has encountered the first eof token.
+    assert(!eof());
     Token = PreviousTokenSource->getNextToken();
     if (eof())
       return createEOF();

unittests/Format/FormatTest.cpp

@@ -394,6 +394,7 @@ TEST_F(FormatTest, FormatsSmallMacroDefinitionsInSingleLine) {
 
 TEST_F(FormatTest, BreaksOnHashWhenDirectiveIsInvalid) {
   EXPECT_EQ("#\n;", format("#;"));
+  verifyFormat("#\n;\n;\n;");
 }
 
 TEST_F(FormatTest, UnescapedEndOfLineEndsPPDirective) {