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// edition:2021
// ignore-tidy-linelength
// only-x86_64
// run-pass
// needs-unwind Asserting on contents of error message
#![allow(path_statements, unused_allocation)]
#![feature(core_intrinsics, generic_assert, generic_assert_internals)]
macro_rules! test {
(
let mut $elem_ident:ident = $elem_expr:expr;
[ $($assert:tt)* ] => $msg:literal
) => {
{
#[allow(unused_assignments, unused_mut, unused_variables)]
let rslt = std::panic::catch_unwind(|| {
let mut $elem_ident = $elem_expr;
assert!($($assert)*);
});
let err = rslt.unwrap_err();
if let Some(elem) = err.downcast_ref::<String>() {
assert_eq!(elem, &$msg);
}
else if let Some(elem) = err.downcast_ref::<&str>() {
assert_eq!(elem, &$msg);
}
else {
panic!("assert!( ... ) should return a string");
}
}
}
}
macro_rules! tests {
(
let mut $elem_ident:ident = $elem_expr:expr;
$(
[ $($elem_assert:tt)* ] => $elem_msg:literal
)+
) => {
$(
test!(
let mut $elem_ident = $elem_expr;
[ $($elem_assert)* ] => $elem_msg
);
)+
}
}
const FOO: Foo = Foo { bar: 1 };
#[derive(Clone, Copy, Debug, PartialEq)]
struct Foo {
bar: i32
}
impl Foo {
fn add(&self, a: i32, b: i32) -> i32 { a + b }
}
fn add(a: i32, b: i32) -> i32 { a + b }
fn main() {
// ***** Allowed *****
tests!(
let mut elem = 1i32;
// addr of
[ &elem == &3 ] => "Assertion failed: &elem == &3\nWith captures:\n elem = 1\n"
// array
[ [elem][0] == 3 ] => "Assertion failed: [elem][0] == 3\nWith captures:\n elem = 1\n"
// binary
[ elem + 1 == 3 ] => "Assertion failed: elem + 1 == 3\nWith captures:\n elem = 1\n"
// call
[ add(elem, elem) == 3 ] => "Assertion failed: add(elem, elem) == 3\nWith captures:\n elem = 1\n"
// cast
[ elem as i32 == 3 ] => "Assertion failed: elem as i32 == 3\nWith captures:\n elem = 1\n"
// index
[ [1i32, 1][elem as usize] == 3 ] => "Assertion failed: [1i32, 1][elem as usize] == 3\nWith captures:\n elem = 1\n"
// method call
[ FOO.add(elem, elem) == 3 ] => "Assertion failed: FOO.add(elem, elem) == 3\nWith captures:\n elem = 1\n"
// paren
[ (elem) == 3 ] => "Assertion failed: (elem) == 3\nWith captures:\n elem = 1\n"
// range
[ (0..elem) == (0..3) ] => "Assertion failed: (0..elem) == (0..3)\nWith captures:\n elem = 1\n"
// repeat
[ [elem; 1] == [3; 1] ] => "Assertion failed: [elem; 1] == [3; 1]\nWith captures:\n elem = 1\n"
// struct
[ Foo { bar: elem } == Foo { bar: 3 } ] => "Assertion failed: Foo { bar: elem } == Foo { bar: 3 }\nWith captures:\n elem = 1\n"
// tuple
[ (elem, 1) == (3, 3) ] => "Assertion failed: (elem, 1) == (3, 3)\nWith captures:\n elem = 1\n"
// unary
[ -elem == -3 ] => "Assertion failed: -elem == -3\nWith captures:\n elem = 1\n"
);
// ***** Disallowed *****
tests!(
let mut elem = 1i32;
// assign
[ { let local = elem; local } == 3 ] => "Assertion failed: { let local = elem; local } == 3"
// assign op
[ { elem += 1; elem } == 3 ] => "Assertion failed: { elem += 1; elem } == 3"
// async
[ { let _ = async { elem }; elem } == 3 ] => "Assertion failed: { let _ = async { elem }; elem } == 3"
// await
// block
[ { elem } == 3 ] => "Assertion failed: { elem } == 3"
// break
[ loop { break elem; } == 3 ] => "Assertion failed: loop { break elem; } == 3"
// closure
[(|| elem)() == 3 ] => "Assertion failed: (|| elem)() == 3"
// const block
// continue
// err
// field
[ FOO.bar == 3 ] => "Assertion failed: FOO.bar == 3"
// for loop
[ { for _ in 0..elem { elem; } elem } == 3 ] => "Assertion failed: { for _ in 0..elem { elem; } elem } == 3"
// if
[ if true { elem } else { elem } == 3 ] => "Assertion failed: if true { elem } else { elem } == 3"
// inline asm
// let
[ if let true = true { elem } else { elem } == 3 ] => "Assertion failed: if let true = true { elem } else { elem } == 3"
// lit
// loop
[ loop { elem; break elem; } == 3 ] => "Assertion failed: loop { elem; break elem; } == 3"
// mac call
// match
[ match elem { _ => elem } == 3 ] => "Assertion failed: (match elem { _ => elem, }) == 3"
// ret
[ (|| { return elem; })() == 3 ] => "Assertion failed: (|| { return elem; })() == 3"
// try
[ (|| { Some(Some(elem)?) })() == Some(3) ] => "Assertion failed: (|| { Some(Some(elem)?) })() == Some(3)"
// try block
// underscore
// while
[ { while false { elem; break; } elem } == 3 ] => "Assertion failed: { while false { elem; break; } elem } == 3"
// yeet
// yield
);
}
|
