makepad/libs/relax/compiler/tests/cfg_fields.rs
Admin b22a714840 makepad run: the Rust JIT (libs/relax) and makepad-remote
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-10-13 12:26:21 +02:00

52 lines
1.1 KiB
Rust

// `#[cfg(..)]` on fields (boot B30/B29): cfg'd-out fields are not part of the type, its layout,
// struct literals, struct patterns or derives. rustc: all pass.
#[derive(Default, Debug, Clone, PartialEq)]
struct S {
a: u32,
#[cfg(windows)]
w: NoSuchType,
#[cfg(not(windows))]
b: u8,
}
#[repr(C)]
struct C {
x: u64,
#[cfg(windows)]
pad: [u64; 4],
y: u32,
}
struct T(u32, #[cfg(windows)] NoSuchType, u16);
enum E {
V {
a: u8,
#[cfg(windows)]
w: NoSuchType,
},
}
#[test]
fn cfg_fields_default_and_size() {
let s = S::default();
assert!(s.a == 0 && s.b == 0);
assert!(s == S { a: 0, #[cfg(windows)] w: NoSuchType, b: 0 });
assert!(std::mem::size_of::<S>() == 8);
}
#[test]
fn cfg_fields_repr_c_layout() {
let c = C { x: 1, #[cfg(windows)] pad: [0; 4], y: 2 };
assert!(std::mem::size_of::<C>() == 16);
assert!(c.x + c.y as u64 == 3);
}
#[test]
fn cfg_fields_tuple_and_pattern() {
let t = T(3, 4);
let T(a, b) = t;
let e = E::V { a: 5, #[cfg(windows)] w: NoSuchType };
let E::V { a: c, #[cfg(windows)] w: _ } = e;
assert!(a as u16 + b + c as u16 == 12);
}