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Suggest inline const blocks for array initialization

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This commit is contained in:
Pavel Grigorenko 2024-06-24 15:30:24 +03:00
parent 2c243d9570
commit ba5ec1fc5c
4 changed files with 26 additions and 66 deletions
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40
compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs
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@ -2915,38 +2915,21 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
}
ObligationCauseCode::RepeatElementCopy {
is_constable,
elt_type,
elt_type: _,
elt_span,
elt_stmt_span,
elt_stmt_span: _,
} => {
err.note(
"the `Copy` trait is required because this value will be copied for each element of the array",
);
let value_kind = match is_constable {
IsConstable::Fn => Some("the result of the function call"),
IsConstable::Ctor => Some("the result of the constructor"),
_ => None,
};
let sm = tcx.sess.source_map();
if let Some(value_kind) = value_kind
if matches!(is_constable, IsConstable::Fn | IsConstable::Ctor)
&& let Ok(snip) = sm.span_to_snippet(elt_span)
{
let help_msg = format!(
"consider creating a new `const` item and initializing it with {value_kind} \
to be used in the repeat position"
);
let indentation = sm.indentation_before(elt_stmt_span).unwrap_or_default();
err.multipart_suggestion(
help_msg,
vec![
(
elt_stmt_span.shrink_to_lo(),
format!(
"const ARRAY_REPEAT_VALUE: {elt_type} = {snip};\n{indentation}"
),
),
(elt_span, "ARRAY_REPEAT_VALUE".to_string()),
],
err.span_suggestion(
elt_span,
"create an inline `const` block",
format!("const {{ {snip} }}"),
Applicability::MachineApplicable,
);
} else {
@ -2954,15 +2937,6 @@ impl<'tcx> TypeErrCtxt<'_, 'tcx> {
err.help("consider using `core::array::from_fn` to initialize the array");
err.help("see https://doc.rust-lang.org/stable/std/array/fn.from_fn.html for more information");
}
if tcx.sess.is_nightly_build()
&& matches!(is_constable, IsConstable::Fn | IsConstable::Ctor)
{
err.help(
"create an inline `const` block, see RFC #2920 \
<https://github.com/rust-lang/rfcs/pull/2920> for more information",
);
}
}
ObligationCauseCode::VariableType(hir_id) => {
if let Some(typeck_results) = &self.typeck_results