bjoernager/rust
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Avoid &format("...") calls in error message code.

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Error message all end up passing into a function as an `impl
Into<{D,Subd}iagnosticMessage>`. If an error message is creatd as
`&format("...")` that means we allocate a string (in the `format!`
call), then take a reference, and then clone (allocating again) the
reference to produce the `{D,Subd}iagnosticMessage`, which is silly.

This commit removes the leading `&` from a lot of these cases. This
means the original `String` is moved into the
`{D,Subd}iagnosticMessage`, avoiding the double allocations. This
requires changing some function argument types from `&str` to `String`
(when all arguments are `String`) or `impl
Into<{D,Subd}iagnosticMessage>` (when some arguments are `String` and
some are `&str`).
This commit is contained in:
Nicholas Nethercote 2023-05-16 16:04:03 +10:00
parent 87a2bc027c
commit 01e33a3600
37 changed files with 139 additions and 133 deletions
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2
compiler/rustc_trait_selection/src/traits/project.rs
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@ -2260,7 +2260,7 @@ fn confirm_param_env_candidate<'cx, 'tcx>(
obligation, poly_cache_entry, e,
);
debug!("confirm_param_env_candidate: {}", msg);
let err = infcx.tcx.ty_error_with_message(obligation.cause.span, &msg);
let err = infcx.tcx.ty_error_with_message(obligation.cause.span, msg);
Progress { term: err.into(), obligations: vec![] }
}
}