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Rollup merge of #136368 - estebank:listify, r=fee1-dead

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Make comma separated lists of anything easier to make for errors

Provide a new function `listify`, meant to be used in cases similar to `pluralize!`. When you have a slice of arbitrary elements that need to be presented to the user, `listify` allows you to turn that into a list of comma separated strings.

This reduces a lot of redundant logic that happens often in diagnostics.
This commit is contained in:
Matthias Krüger 2025-02-02 12:31:57 +01:00 • committed by GitHub
commit 3559a48b8e
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11 changed files with 88 additions and 148 deletions
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20
compiler/rustc_borrowck/src/diagnostics/mod.rs
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@ -4,7 +4,7 @@ use std::collections::BTreeMap;
use rustc_abi::{FieldIdx, VariantIdx};
use rustc_data_structures::fx::FxIndexMap;
use rustc_errors::{Applicability, Diag, EmissionGuarantee, MultiSpan};
use rustc_errors::{Applicability, Diag, EmissionGuarantee, MultiSpan, listify};
use rustc_hir::def::{CtorKind, Namespace};
use rustc_hir::{self as hir, CoroutineKind, LangItem};
use rustc_index::IndexSlice;
@ -29,7 +29,7 @@ use rustc_trait_selection::error_reporting::InferCtxtErrorExt;
use rustc_trait_selection::error_reporting::traits::call_kind::{CallDesugaringKind, call_kind};
use rustc_trait_selection::infer::InferCtxtExt;
use rustc_trait_selection::traits::{
FulfillmentErrorCode, type_known_to_meet_bound_modulo_regions,
FulfillmentError, FulfillmentErrorCode, type_known_to_meet_bound_modulo_regions,
};
use tracing::debug;
@ -1434,17 +1434,15 @@ impl<'infcx, 'tcx> MirBorrowckCtxt<'_, 'infcx, 'tcx> {
error.obligation.predicate,
)
}
[errors @ .., last] => {
_ => {
format!(
"you could `clone` the value and consume it, if the \
following trait bounds could be satisfied: \
{} and `{}`",
errors
.iter()
.map(|e| format!("`{}`", e.obligation.predicate))
.collect::<Vec<_>>()
.join(", "),
last.obligation.predicate,
following trait bounds could be satisfied: {}",
listify(&errors, |e: &FulfillmentError<'tcx>| format!(
"`{}`",
e.obligation.predicate
))
.unwrap(),
)
}
};