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37ed7a4438
This is a very large commit since a lot needs to be changed in order to make the tests pass. The salient changes are: - `ConstArgKind` gets a new `Path` variant, and all const params are now represented using it. Non-param paths still use `ConstArgKind::Anon` to prevent this change from getting too large, but they will soon use the `Path` variant too. - `ConstArg` gets a distinct `hir_id` field and its own variant in `hir::Node`. This affected many parts of the compiler that expected the parent of an `AnonConst` to be the containing context (e.g., an array repeat expression). They have been changed to check the "grandparent" where necessary. - Some `ast::AnonConst`s now have their `DefId`s created in rustc_ast_lowering rather than `DefCollector`. This is because in some cases they will end up becoming a `ConstArgKind::Path` instead, which has no `DefId`. We have to solve this in a hacky way where we guess whether the `AnonConst` could end up as a path const since we can't know for sure until after name resolution (`N` could refer to a free const or a nullary struct). If it has no chance as being a const param, then we create a `DefId` in `DefCollector` -- otherwise we decide during ast_lowering. This will have to be updated once all path consts use `ConstArgKind::Path`. - We explicitly use `ConstArgHasType` for array lengths, rather than implicitly relying on anon const type feeding -- this is due to the addition of `ConstArgKind::Path`. - Some tests have their outputs changed, but the changes are for the most part minor (including removing duplicate or almost-duplicate errors). One test now ICEs, but it is for an incomplete, unstable feature and is now tracked at #127009.
110 lines
2.9 KiB
Rust
110 lines
2.9 KiB
Rust
#![feature(transmute_generic_consts)]
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#![feature(generic_const_exprs)]
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#![allow(incomplete_features)]
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fn foo<const W: usize, const H: usize>(v: [[u32;H+1]; W]) -> [[u32; W+1]; H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR cannot transmute
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}
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}
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fn bar<const W: bool, const H: usize>(v: [[u32; H]; W]) -> [[u32; W]; H] {
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//~^ ERROR the constant `W` is not of type `usize`
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR the constant `W` is not of type `usize`
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}
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}
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fn baz<const W: usize, const H: usize>(v: [[u32; H]; W]) -> [u32; W * H * H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR cannot transmute
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}
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}
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fn overflow(v: [[[u32; 8888888]; 9999999]; 777777777]) -> [[[u32; 9999999]; 777777777]; 8888888] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR cannot transmute
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}
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}
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fn transpose<const W: usize, const H: usize>(v: [[u32;H]; W]) -> [[u32; W]; H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn ident<const W: usize, const H: usize>(v: [[u32; H]; W]) -> [[u32; H]; W] {
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unsafe {
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std::mem::transmute(v)
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}
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}
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fn flatten<const W: usize, const H: usize>(v: [[u32; H]; W]) -> [u32; W * H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn coagulate<const W: usize, const H: usize>(v: [u32; H*W]) -> [[u32; W];H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn flatten_3d<const W: usize, const H: usize, const D: usize>(
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v: [[[u32; D]; H]; W]
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) -> [u32; D * W * H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn flatten_somewhat<const W: usize, const H: usize, const D: usize>(
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v: [[[u32; D]; H]; W]
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) -> [[u32; D * W]; H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn known_size<const L: usize>(v: [u16; L]) -> [u8; L * 2] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn condense_bytes<const L: usize>(v: [u8; L * 2]) -> [u16; L] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn singleton_each<const L: usize>(v: [u8; L]) -> [[u8;1]; L] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn transpose_with_const<const W: usize, const H: usize>(
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v: [[u32; 2 * H]; W + W]
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) -> [[u32; W + W]; 2 * H] {
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unsafe {
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std::mem::transmute(v)
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//~^ ERROR: cannot transmute between types of different sizes, or dependently-sized types
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}
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}
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fn main() {}
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