Fix bug that was diagnosing non-paren sizeof incorrectly, closes #566

Author: hsutter

regression-tests/test-results/version

@@ -1,5 +1,5 @@
 
-cppfront compiler v0.2.1   Build 8809:1933
+cppfront compiler v0.2.1   Build 8809:2009
 Copyright(c) Herb Sutter   All rights reserved
 
 SPDX-License-Identifier: CC-BY-NC-ND-4.0

source/build.info

@@ -1 +1 @@
-"8809:1933"
+"8809:2009"

source/parse.h

@@ -4884,7 +4884,11 @@ class parser
                 error( "use 'new<" + curr().to_string(true) + ">', not 'new " + curr().to_string(true) + "'", false);
                 return {};
             }
-            if (*n->identifier == "sizeof") {
+            if (
+                *n->identifier == "sizeof"
+                && curr().type() != lexeme::LeftParen
+                )
+            {
                 error( "use 'sizeof(" + curr().to_string(true) + ")', not 'sizeof " + curr().to_string(true) + "'", false);
                 return {};
             }