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Ensure correct aligement of rustc_hir::Lifetime on platforms with lower default alignments. #144578

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Jul 29, 2025
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Ensure correct aligement of rustc_hir::Lifetime on platforms with lower default alignments. #144578

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5 changes: 5 additions & 0 deletions compiler/rustc_hir/src/hir.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -148,6 +148,11 @@ impl From<Ident> for LifetimeSyntax {
/// `LifetimeSource::OutlivesBound` or `LifetimeSource::PreciseCapturing`
/// — there's no way to "elide" these lifetimes.
#[derive(Debug, Copy, Clone, HashStable_Generic)]
// Raise the aligement to at least 4 bytes - this is relied on in other parts of the compiler(for pointer tagging):
// https://github.com/rust-lang/rust/blob/ce5fdd7d42aba9a2925692e11af2bd39cf37798a/compiler/rustc_data_structures/src/tagged_ptr.rs#L163
// Removing this `repr(4)` will cause the compiler to not build on platforms like `m68k` Linux, where the aligement of u32 and usize is only 2.
// Since `repr(align)` may only raise aligement, this has no effect on platforms where the aligement is already sufficient.
#[repr(align(4))]
pub struct Lifetime {
#[stable_hasher(ignore)]
pub hir_id: HirId,
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