From 2b9d332580283b976bb7adb7432bd77bda5dc9b4 Mon Sep 17 00:00:00 2001
From: Stephen Heumann <stephenheumann@gmail.com>
Date: Sun, 22 Aug 2021 20:33:34 -0500
Subject: [PATCH] Give an appropriate error for an illegal operator in a
 constant expression.

This was being reported as an "illegal type cast".
---
 Expression.pas | 2 +-
 Scanner.pas    | 1 +
 cc.notes       | 2 ++
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Expression.pas b/Expression.pas
index 88e6cf4..474c722 100644
--- a/Expression.pas
+++ b/Expression.pas
@@ -2163,7 +2163,7 @@ if token.kind in startExpression then begin
                       and (token.kind = sizeofsy))
                   or ((kind <> initializerExpression)
                       and (token.kind = uand)) then begin
-                  Error(40);
+                  Error(161);
                   errorFound := true;
                   end; {if}
             if token.kind in         {make sure we get what we want}
diff --git a/Scanner.pas b/Scanner.pas
index 4057b20..2c0c881 100644
--- a/Scanner.pas
+++ b/Scanner.pas
@@ -714,6 +714,7 @@ if list or (numErr <> 0) then begin
         158: msg := @'_Generic expression includes two compatible types';
         159: msg := @'_Generic expression includes multiple default cases';
         160: msg := @'no matching association in _Generic expression';
+        161: msg := @'illegal operator in a constant expression';
          otherwise: Error(57);
          end; {case}
        writeln(msg^);
diff --git a/cc.notes b/cc.notes
index 42902c6..4ed80d8 100644
--- a/cc.notes
+++ b/cc.notes
@@ -1196,6 +1196,8 @@ int foo(int[42]);
 
 157. An error was not reported if code tried to define an enumeration constant with a value in the range 0xFFFF8000 to 0xFFFFFFFF.  (Enumeration constants are limited to values representable as an int.)
 
+158. An "illegal type cast" error would be reported when an illegal operator was used in a constant expression.  An appropriate error message is now produced.
+
 -- Bugs from C 2.1.0 that have been fixed -----------------------------------
 
 1.  In some situations, fread() reread the first 1K or so of the file.