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Nicholas Nethercote
1a9a284ad2
`derive(HashStable_Generic)` generates impls like this:
```
impl<__CTX> HashStable<__CTX> for ExpnKind
where
__CTX: crate::HashStableContext
{
fn hash_stable(&self, hcx : &mut __CTX, __hasher: &mut StableHasher) {
...
}
}
```
This is used for crates that are upstream of `rustc_middle`.
The `crate::HashStableContext` bound means every crate that uses
`derive(HashStable_Generic)` must provide (or import) a trait
`HashStableContext` which `rustc_middle` then impls. In `rustc_span`
this trait is sensible, with three methods. In other crates, this trait
is empty, and there is the following trait hierarchy:
```
rustc_session::HashStableContext
| |
| rustc_hir::HashStableContext
| / \
rustc_ast::HashStableContext rustc_abi::HashStableContext
|
rustc_span::HashStableContext
```
All very strange and unnecessary. This commit changes
`derive(HashStable_Generic)` to use `rustc_span::HashStableContext`
instead of `crate::HashStableContext`. This eliminates the need for all
the empty `HashStableContext` traits and impls. Much better.
32 lines
825 B
Rust
32 lines
825 B
Rust
// tidy-alphabetical-start
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#![allow(internal_features)]
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#![feature(const_option_ops)]
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#![feature(const_trait_impl)]
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#![feature(default_field_values)]
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#![feature(iter_intersperse)]
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#![feature(macro_derive)]
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#![feature(rustc_attrs)]
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// To generate CodegenOptionsTargetModifiers and UnstableOptionsTargetModifiers enums
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// with macro_rules, it is necessary to use recursive mechanic ("Incremental TT Munchers").
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#![recursion_limit = "256"]
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// tidy-alphabetical-end
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pub use getopts;
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pub use lint::{declare_lint, declare_lint_pass, declare_tool_lint, impl_lint_pass};
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pub use rustc_lint_defs as lint;
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pub use session::*;
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pub mod code_stats;
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pub mod errors;
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pub mod parse;
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pub mod utils;
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#[macro_use]
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pub mod config;
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pub mod cstore;
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pub mod filesearch;
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mod macros;
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mod options;
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pub mod output;
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pub mod search_paths;
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mod session;
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