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|
// Test that the correct error is emitted when `#[loop_match]` is applied to
// syntax it does not support.
#![allow(incomplete_features)]
#![feature(loop_match)]
#![crate_type = "lib"]
enum State {
A,
B,
C,
}
fn invalid_update() {
let mut fake = State::A;
let state = State::A;
#[loop_match]
loop {
fake = 'blk: {
//~^ ERROR invalid update of the `#[loop_match]` state
match state {
_ => State::B,
}
}
}
}
fn invalid_scrutinee() {
let mut state = State::A;
#[loop_match]
loop {
state = 'blk: {
match State::A {
//~^ ERROR invalid match on `#[loop_match]` state
_ => State::B,
}
}
}
}
fn bad_statements_1() {
let mut state = State::A;
#[loop_match]
loop {
1;
//~^ ERROR statements are not allowed in this position within a `#[loop_match]`
state = 'blk: {
match State::A {
_ => State::B,
}
}
}
}
fn bad_statements_2() {
let mut state = State::A;
#[loop_match]
loop {
state = 'blk: {
1;
//~^ ERROR statements are not allowed in this position within a `#[loop_match]`
match State::A {
_ => State::B,
}
}
}
}
fn bad_rhs_1() {
let mut state = State::A;
#[loop_match]
loop {
state = State::B
//~^ ERROR this expression must be a single `match` wrapped in a labeled block
}
}
fn bad_rhs_2() {
let mut state = State::A;
#[loop_match]
loop {
state = 'blk: {
State::B
//~^ ERROR this expression must be a single `match` wrapped in a labeled block
}
}
}
fn bad_rhs_3() {
let mut state = ();
#[loop_match]
loop {
state = 'blk: {
//~^ ERROR this expression must be a single `match` wrapped in a labeled block
}
}
}
fn missing_assignment() {
#[loop_match]
loop {
() //~ ERROR expected a single assignment expression
}
}
fn empty_loop_body() {
#[loop_match]
loop {
//~^ ERROR expected a single assignment expression
}
}
fn break_without_value() {
let mut state = State::A;
#[loop_match]
'a: loop {
state = 'blk: {
match state {
State::A => {
#[const_continue]
break 'blk;
//~^ ERROR mismatched types
}
_ => break 'a,
}
}
}
}
fn break_without_value_unit() {
let mut state = ();
#[loop_match]
'a: loop {
state = 'blk: {
match state {
() => {
#[const_continue]
break 'blk;
//~^ ERROR a `#[const_continue]` must break to a label with a value
}
}
}
}
}
fn break_without_label() {
let mut state = State::A;
let _ = {
#[loop_match]
loop {
state = 'blk: {
match state {
_ => {
#[const_continue]
break State::A;
//~^ ERROR unlabeled `break` inside of a labeled block
//~| ERROR a `#[const_continue]` must break to a label with a value
}
}
}
}
};
}
fn arm_has_guard(cond: bool) {
let mut state = State::A;
#[loop_match]
'a: loop {
state = 'blk: {
match state {
State::A => {
#[const_continue]
break 'blk State::B;
}
State::B if cond => break 'a,
//~^ ERROR match arms that are part of a `#[loop_match]` cannot have guards
_ => break 'a,
}
}
}
}
fn non_exhaustive() {
let mut state = State::A;
#[loop_match]
loop {
state = 'blk: {
match state {
//~^ ERROR non-exhaustive patterns: `State::B` and `State::C` not covered
State::A => State::B,
}
}
}
}
fn invalid_range_pattern(state: f32) {
#[loop_match]
loop {
state = 'blk: {
match state {
1.0 => {
#[const_continue]
break 'blk 2.5;
}
4.0..3.0 => {
//~^ ERROR lower range bound must be less than upper
todo!()
}
}
}
}
}
|
