c argument names in bindings

compiler/parser/parser.odin

@@ -1110,7 +1110,7 @@ parse_params :: proc(parser: ^Parser) -> ([]ast.Param, bool) {
 		names: [dynamic]token.Token
 		names.allocator = parser.module.allocator
 		for {
-			if current(parser).kind != .Identifier {
+			if current(parser).kind != .Identifier && current(parser).kind != .Underscore {
 				source.add(parser.diagnostics, current(parser).span, "expected parameter name")
 				break
 			}