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// edition:2018
#![crate_type = "lib"]
#![feature(type_ascription)]
use std::future::Future;
use std::pin::Pin;
// This tests the parser for "x as Y[z]". It errors, but we want to give useful
// errors and parse such that further code gives useful errors.
pub fn index_after_as_cast() {
vec![1, 2, 3] as Vec<i32>[0];
//~^ ERROR: cast cannot be followed by indexing
vec![1, 2, 3]: Vec<i32>[0];
//~^ ERROR: type ascription cannot be followed by indexing
}
pub fn index_after_cast_to_index() {
(&[0]) as &[i32][0];
//~^ ERROR: cast cannot be followed by indexing
(&[0i32]): &[i32; 1][0];
//~^ ERROR: type ascription cannot be followed by indexing
}
pub fn cast_after_cast() {
if 5u64 as i32 as u16 == 0u16 {
}
if 5u64: u64: u64 == 0u64 {
}
let _ = 5u64: u64: u64 as u8 as i8 == 9i8;
let _ = 0i32: i32: i32;
let _ = 0 as i32: i32;
let _ = 0i32: i32 as i32;
let _ = 0 as i32 as i32;
let _ = 0i32: i32: i32 as u32 as i32;
}
pub fn cast_cast_method_call() {
let _ = 0i32: i32: i32.count_ones();
//~^ ERROR: type ascription cannot be followed by a method call
let _ = 0 as i32: i32.count_ones();
//~^ ERROR: type ascription cannot be followed by a method call
let _ = 0i32: i32 as i32.count_ones();
//~^ ERROR: cast cannot be followed by a method call
let _ = 0 as i32 as i32.count_ones();
//~^ ERROR: cast cannot be followed by a method call
let _ = 0i32: i32: i32 as u32 as i32.count_ones();
//~^ ERROR: cast cannot be followed by a method call
let _ = 0i32: i32.count_ones(): u32;
//~^ ERROR: type ascription cannot be followed by a method call
let _ = 0 as i32.count_ones(): u32;
//~^ ERROR: cast cannot be followed by a method call
let _ = 0i32: i32.count_ones() as u32;
//~^ ERROR: type ascription cannot be followed by a method call
let _ = 0 as i32.count_ones() as u32;
//~^ ERROR: cast cannot be followed by a method call
let _ = 0i32: i32: i32.count_ones() as u32 as i32;
//~^ ERROR: type ascription cannot be followed by a method call
}
pub fn multiline_error() {
let _ = 0
as i32
.count_ones();
//~^^^ ERROR: cast cannot be followed by a method call
}
// this tests that the precedence for `!x as Y.Z` is still what we expect
pub fn precedence() {
let x: i32 = &vec![1, 2, 3] as &Vec<i32>[0];
//~^ ERROR: cast cannot be followed by indexing
}
pub fn method_calls() {
0 as i32.max(0);
//~^ ERROR: cast cannot be followed by a method call
0: i32.max(0);
//~^ ERROR: type ascription cannot be followed by a method call
}
pub fn complex() {
let _ = format!(
"{} and {}",
if true { 33 } else { 44 } as i32.max(0),
//~^ ERROR: cast cannot be followed by a method call
if true { 33 } else { 44 }: i32.max(0)
//~^ ERROR: type ascription cannot be followed by a method call
);
}
pub fn in_condition() {
if 5u64 as i32.max(0) == 0 {
//~^ ERROR: cast cannot be followed by a method call
}
if 5u64: u64.max(0) == 0 {
//~^ ERROR: type ascription cannot be followed by a method call
}
}
pub fn inside_block() {
let _ = if true {
5u64 as u32.max(0) == 0
//~^ ERROR: cast cannot be followed by a method call
} else { false };
let _ = if true {
5u64: u64.max(0) == 0
//~^ ERROR: type ascription cannot be followed by a method call
} else { false };
}
static bar: &[i32] = &(&[1,2,3] as &[i32][0..1]);
//~^ ERROR: cast cannot be followed by indexing
static bar2: &[i32] = &(&[1i32,2,3]: &[i32; 3][0..1]);
//~^ ERROR: type ascription cannot be followed by indexing
pub fn cast_then_try() -> Result<u64,u64> {
Err(0u64) as Result<u64,u64>?;
//~^ ERROR: cast cannot be followed by `?`
Err(0u64): Result<u64,u64>?;
//~^ ERROR: type ascription cannot be followed by `?`
Ok(1)
}
pub fn cast_then_call() {
type F = fn(u8);
// type ascription won't actually do [unique drop fn type] -> fn(u8) casts.
let drop_ptr = drop as fn(u8);
drop as F();
//~^ ERROR: parenthesized type parameters may only be used with a `Fn` trait [E0214]
drop_ptr: F();
//~^ ERROR: parenthesized type parameters may only be used with a `Fn` trait [E0214]
}
pub fn cast_to_fn_should_work() {
let drop_ptr = drop as fn(u8);
drop as fn(u8);
drop_ptr: fn(u8);
}
pub fn parens_after_cast_error() {
let drop_ptr = drop as fn(u8);
drop as fn(u8)(0);
//~^ ERROR: cast cannot be followed by a function call
drop_ptr: fn(u8)(0);
//~^ ERROR: type ascription cannot be followed by a function call
}
pub async fn cast_then_await() {
Box::pin(noop()) as Pin<Box<dyn Future<Output = ()>>>.await;
//~^ ERROR: cast cannot be followed by `.await`
Box::pin(noop()): Pin<Box<_>>.await;
//~^ ERROR: type ascription cannot be followed by `.await`
}
pub async fn noop() {}
#[derive(Default)]
pub struct Foo {
pub bar: u32,
}
pub fn struct_field() {
Foo::default() as Foo.bar;
//~^ ERROR: cannot be followed by a field access
Foo::default(): Foo.bar;
//~^ ERROR: type ascription cannot be followed by a field access
}
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