make the parser report '&&' as an error instead of treating it as bitwise and followed by address-of.

compiler/test/ast/TestVarious.kt

@@ -49,5 +49,17 @@ main {
 }"""
         compileText(C64Target(), false, text, writeAssembly = true) shouldNotBe null
     }
+
+    test("invalid && operator") {
+        val text="""
+main {
+    sub start() {
+        uword b1
+        uword b2
+        uword b3 = b1 && b2     ; invalid syntax: '&&' is not an operator, 'and' should be used instead
+    }
+}"""
+        compileText(C64Target(), false, text, writeAssembly = false) shouldBe null
+    }
 })
 

examples/cx16/keyboardhandler.p8

@@ -0,0 +1,57 @@
+%import textio
+%zeropage basicsafe
+%option no_sysinit
+
+main {
+
+    sub start() {
+
+        txt.print("ps2 scancode handler test - press keys! esc to quit!\n")
+
+        sys.set_irqd()
+        uword old_keyhdl = cx16.KEYHDL
+        cx16.KEYHDL = &main.keyboard_scancode_handler.asm_shim
+        sys.clear_irqd()
+
+        ubyte escape_pressed
+        while not escape_pressed {
+            ; just sit here
+        }
+        sys.set_irqd()
+        cx16.KEYHDL = old_keyhdl
+        sys.clear_irqd()
+    }
+
+    sub keyboard_scancode_handler(ubyte prefix, ubyte scancode, ubyte updown) {
+        txt.print_ub(prefix)
+        txt.spc()
+        txt.print_ub(scancode)
+        txt.spc()
+        if updown
+            txt.chrout('u')
+        else
+            txt.chrout('d')
+        txt.nl()
+        if prefix==0 and scancode==119 and updown {
+            ; escape was pressed! exit back to basic
+            main.start.escape_pressed = true
+        }
+        return
+
+asm_shim:
+        %asm {{
+            php
+            pha
+            phx
+            sta  scancode
+            stz  updown
+            bcc  +
+            inc  updown
++           jsr  keyboard_scancode_handler
+            plx
+            pla
+            plp
+            rts
+        }}
+    }
+}

parser/antlr/Prog8ANTLR.g4

@@ -27,7 +27,8 @@ NAME :  [a-zA-Z][a-zA-Z0-9_]* ;
 DEC_INTEGER :  ('0'..'9') | (('1'..'9')('0'..'9')+);
 HEX_INTEGER :  '$' (('a'..'f') | ('A'..'F') | ('0'..'9'))+ ;
 BIN_INTEGER :  '%' ('0' | '1')+ ;
-ADDRESS_OF: '&';
+ADDRESS_OF: '&' ;
+INVALID_AND_COMPOSITE: '&&' ;
 
 FLOAT_NUMBER :  FNUMBER (('E'|'e') ('+' | '-')? FNUMBER)? ;	// sign comes later from unary expression
 fragment FNUMBER :  ('0' .. '9') + ('.' ('0' .. '9') +)? ;