makepad/libs/relax/compiler/tests/n01_instance_projection.rs
Admin b22a714840 makepad run: the Rust JIT (libs/relax) and makepad-remote
The JIT that runs makepad apps from source: lexer, front end, type checker,
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warm/cold caches keyed by compiler stamp, provided crates bound late,
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`makepad`, MAKEPAD_RUN_* env, ~/.makepad-run); libs/relax stays the internal
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WM (app/1): grabs, captures, traces, frame profiles and tweaks.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-13 12:26:21 +02:00

42 lines
1.3 KiB
Rust

// rustc_middle/src/ty/instance.rs:955-992: instantiate before normalizing.
trait Source { type Item; }
struct A;
struct B;
impl Source for A { type Item = u32; }
impl Source for B { type Item = u64; }
#[inline(never)]
fn wrap<T: Source>(x: T::Item) -> Option<T::Item> { Some(x) }
#[test]
fn rigid_projection_in_generic_body() {
assert_eq!(wrap::<A>(7), Some(7u32));
assert_eq!(wrap::<B>(11), Some(11u64));
}
#[inline(never)]
fn slice_part<I: std::slice::SliceIndex<[u8]>>(s: &mut [u8], i: I) -> &mut I::Output {
&mut s[i]
}
#[test]
fn projected_index_preserves_slice_metadata() {
let mut bytes = [1, 2, 3, 4];
let part = slice_part(&mut bytes, 1..3);
assert_eq!(part.len(), 2);
part[1] = 9;
assert_eq!(bytes[2], 9);
}
#[inline(never)]
fn generic_assign<T: std::ops::AddAssign<T>>(values: &mut [T], rhs: T, order: &std::cell::Cell<u8>) {
values[{ order.set(1); 0 }] += { assert_eq!(order.get(), 1); rhs };
}
#[test]
fn generic_compound_assignment_keeps_declared_evaluation_order() {
let order = std::cell::Cell::new(0);
let mut values = [1u32];
generic_assign(&mut values, 2, &order);
assert_eq!(values[0], 3);
order.set(0);
values[{ order.set(1); 0 }] += { assert_eq!(order.get(), 0); 4 };
assert_eq!(values[0], 7);
}