ww: hare-feature batch (_, const, [_]T, ..., size/offset, assert, for-else)

cmd/wcc/tok.c

@@ -19,6 +19,7 @@ static const struct kwent kwtab[] = {
 	{ "break",    TK_BREAK    },
 	{ "case",     TK_CASE     },
 	{ "chan",     TK_CHAN     },
+	{ "const",    TK_CONST    },
 	{ "continue", TK_CONTINUE },
 	{ "def",      TK_DEF      },
 	{ "defer",    TK_DEFER    },
@@ -90,6 +91,8 @@ tokname(Tkind k)
 	case TK_AS:		return "as";
 	case TK_STATIC:		return "static";
 	case TK_MATCH:		return "match";
+	case TK_CONST:		return "const";
+	case TK_UNDER:		return "_";
 
 	case TK_LPAREN:		return "(";
 	case TK_RPAREN:		return ")";