boolean: don't allow NEG unary op '-' on boolean data types

- negative booleans were allowed for compatibility with fbc test suite (prior to Jan 2018)
- can be removed now since test-suite has been re-written

Author: jayrm

changelog.txt

@@ -4,6 +4,7 @@ Version 1.06.0
 - Adjusted warning text for "mixed bool/nonbool operands" warning
 - test-suite uses libfbcunit for unit testing framework
 - SELECT CASE AS CONST respects data type and will show overflow warnings on out-of-range constants
+- boolean: don't allow NEG unary op '-' on boolean data types
 
 [added]
 - -noobjinfo option to disable the writing/reading of compile-time library and other linking options from/to .o and .a files. This also disables the use of fbextra.x (the supplemental linker script) for discarding the .fbctinf sections, which is useful when using the gold linker that doesn't support this kind of linker script.
@@ -58,6 +59,7 @@ Version 1.06.0
 - #878: Fix fbc-64bit hangs on 'Case True' + 'Case False' inside 'Select Case As const'
 - Fix SELECT CASE AS CONST to allow both signed & unsigned case range values
 
+
 Version 1.05.0
 
 [changed]

src/compiler/ast-node-uop.bas

@@ -182,8 +182,6 @@ function astNewUOP _
 	if( typeGetDtAndPtrOnly( o->dtype ) = FB_DATATYPE_BOOLEAN ) then
 		if( op = AST_OP_NOT ) then
 			do_promote = FALSE
-		elseif( op = AST_OP_NEG ) then
-			'' allow it or test suite can't compile
 		else
 			'' no other operation allowed with booleans
 			exit function

tests/boolean/boolean_uop.bas

@@ -32,9 +32,6 @@ SUITE( fbc_tests.boolean_.boolean_uop )
 		dot( not, FALSE )
 		dot( not, TRUE )
 
-		dot( -, FALSE )
-		dot( -, TRUE )
-
 	END_TEST
 
 END_SUITE