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Allow multiple impl Into<{D,Subd}iagMessage> parameters in a function.

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The internal diagnostic lint currently only allows one, because that was
all that occurred in practice. But rust-lang/rust-clippy/pull/12453
wants to introduce functions with more than one, and this limitation is
getting in the way.
This commit is contained in:
Nicholas Nethercote 2024-03-11 09:06:08 +11:00
parent c69fda7dc6
commit 47b4b8e8c5
2 changed files with 13 additions and 14 deletions
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17
compiler/rustc_lint/src/internal.rs
View file

@ -409,9 +409,8 @@ impl LateLintPass<'_> for Diagnostics {
}
};
// Does the callee have a `impl Into<{D,Subd}iagMessage>` parameter? (There should be at
// most one.)
let mut impl_into_diagnostic_message_param = None;
// Does the callee have one or more `impl Into<{D,Subd}iagMessage>` parameters?
let mut impl_into_diagnostic_message_params = vec![];
let fn_sig = cx.tcx.fn_sig(def_id).instantiate_identity().skip_binder();
let predicates = cx.tcx.predicates_of(def_id).instantiate_identity(cx.tcx).predicates;
for (i, &param_ty) in fn_sig.inputs().iter().enumerate() {
@ -425,20 +424,14 @@ impl LateLintPass<'_> for Diagnostics {
&& let ty1 = trait_ref.args.type_at(1)
&& is_diag_message(ty1)
{
if impl_into_diagnostic_message_param.is_some() {
cx.tcx.dcx().span_bug(
span,
"can't handle multiple `impl Into<{D,Sub}iagMessage>` params",
);
}
impl_into_diagnostic_message_param = Some((i, p.name));
impl_into_diagnostic_message_params.push((i, p.name));
}
}
}
}
// Is the callee interesting?
if !has_attr && impl_into_diagnostic_message_param.is_none() {
if !has_attr && impl_into_diagnostic_message_params.is_empty() {
return;
}
@ -481,7 +474,7 @@ impl LateLintPass<'_> for Diagnostics {
// Calls to methods with an `impl Into<{D,Subd}iagMessage>` parameter must be passed an arg
// with type `{D,Subd}iagMessage` or `impl Into<{D,Subd}iagMessage>`. Otherwise, emit an
// `UNTRANSLATABLE_DIAGNOSTIC` lint.
if let Some((param_i, param_i_p_name)) = impl_into_diagnostic_message_param {
for (param_i, param_i_p_name) in impl_into_diagnostic_message_params {
// Is the arg type `{Sub,D}iagMessage`or `impl Into<{Sub,D}iagMessage>`?
let arg_ty = call_tys[param_i];
let is_translatable = is_diag_message(arg_ty)