Added postfix ! and !! operators

Author: totalspectrum

Changelog.txt

@@ -1,5 +1,6 @@
 Version 6.6.0
 - Added pc_key and pc_mouse to -gbrk
+- Added missing !! and ! postfix operators for Spin2
 - Implemented proper boolean type for C
 - Fixed -- operator for floats
 - Made the BASIC boolean type a distinct type

frontends/spin/spin.y

@@ -1618,6 +1618,16 @@ expr:
     { $$ = NewAST(AST_POSTSET, $1, AstInteger(0)); }
   | lhs SP_DOUBLETILDE
     { $$ = NewAST(AST_POSTSET, $1, AstInteger(-1)); }
+  | lhs SP_NOT
+    {
+        AST *lhs = $1;
+        $$ = NewAST(AST_POSTSET, lhs, AstOperator(K_BOOL_NOT, NULL, DupAST(lhs)));
+    }
+  | lhs '!'
+    {
+        AST *lhs = $1;
+        $$ = NewAST(AST_POSTSET, lhs, AstOperator(K_BIT_NOT, NULL, DupAST(lhs)));
+    }
   | '~' lhs
     { AST *shf;
       AST *val = $2;