[Mono-bugs] [Bug 31420][Nor] New - expressions with enum types

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Changed by lupus@ximian.com.

http://bugzilla.ximian.com/show_bug.cgi?id=31420

--- shadow/31420	Sat Sep 28 06:09:02 2002
+++ shadow/31420.tmp.1157	Sat Sep 28 06:09:02 2002
@@ -0,0 +1,45 @@
+Bug#: 31420
+Product: Mono/MCS
+Version: unspecified
+OS: other
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: Misc
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: lupus@ximian.com               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: expressions with enum types
+
+The C# spec re the + and - operators with enum types is very weird
+and mcs doesn't follow the spec (14.7.4 and 14.7.5): I didn't check other
+operators, but there may be similar issues.
+The following sample does compile with csc, but not with mcs.
+I commented out some expressions that must make the compiler output an error.
+It is weird, because the spec defines different default implicit operators
+for addition and subtraction, so in some expressions using - is allowed,
+but not +.
+enum E {
+        ZERO,
+        ONE,
+        TWO = ONE + ONE
+}
+class T {
+        static void Main () {
+                E a = E.ONE;
+                E b = E.ONE;
+//              bool val = (a + b) < 10;
+                bool val2 = (a - b) < 10;
+//              E c = a - b;
+                int c2 = a - b;
+//              int c3 = a + b;
+//              int c3 = a + 1;
+                E c3 = a + 1;
+//              E c4 = a + b;
+        }
+}