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Permit `asm_const` and `asm_sym` to reference generic params Related #96557 These constructs will be allowed: ```rust fn foofoo<const N: usize>() {} unsafe fn foo<const N: usize>() { asm!("/* {0} */", const N); asm!("/* {0} */", const N + 1); asm!("/* {0} */", sym foofoo::<N>); } fn barbar<T>() {} unsafe fn bar<T>() { asm!("/* {0} */", const std::mem::size_of::<T>()); asm!("/* {0} */", const std::mem::size_of::<(T, T)>()); asm!("/* {0} */", sym barbar::<T>); asm!("/* {0} */", sym barbar::<(T, T)>); } ``` `@Amanieu,` I didn't switch inline asms to use `DefKind::InlineAsm`, as I see little value doing that; given that no type inference is needed, it will only make typecking slower and more complex but will have no real gains. I did switch them to follow the same code path as inline asm during symbol resolution, though. The `error: unconstrained generic constant` you mentioned in #76001 is due to the fact that `to_const` will actually add a wfness obligation to the constant, which we don't need for `asm_const`, so I have that removed. `@rustbot` label: +A-inline-assembly +F-asm |
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The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).
For more information about how these things work in rustc, see the rustc dev guide: