bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Make comma separated lists of anything easier to make for errors

Browse source 
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:
Esteban Küber 2025-01-31 20:36:44 +00:00
parent 7f36543a48
commit 8e9422f94e
11 changed files with 88 additions and 148 deletions
Download patch file Download diff file Expand all files Collapse all files

16
compiler/rustc_middle/src/ty/diagnostics.rs
View file

@ -5,7 +5,7 @@ use std::ops::ControlFlow;
use rustc_data_structures::fx::FxHashMap;
use rustc_errors::{
Applicability, Diag, DiagArgValue, IntoDiagArg, into_diag_arg_using_display, pluralize,
Applicability, Diag, DiagArgValue, IntoDiagArg, into_diag_arg_using_display, listify, pluralize,
};
use rustc_hir::def::DefKind;
use rustc_hir::def_id::DefId;
@ -362,11 +362,8 @@ pub fn suggest_constraining_type_params<'a>(
let n = trait_names.len();
let stable = if all_stable { "" } else { "unstable " };
let trait_ = if all_known { format!("trait{}", pluralize!(n)) } else { String::new() };
format!("{stable}{trait_}{}", match &trait_names[..] {
[t] => format!(" {t}"),
[ts @ .., last] => format!(" {} and {last}", ts.join(", ")),
[] => return false,
},)
let Some(trait_names) = listify(&trait_names, |n| n.to_string()) else { return false };
format!("{stable}{trait_} {trait_names}")
} else {
// We're more explicit when there's a mix of stable and unstable traits.
let mut trait_names = constraints
@ -378,10 +375,9 @@ pub fn suggest_constraining_type_params<'a>(
.collect::<Vec<_>>();
trait_names.sort();
trait_names.dedup();
match &trait_names[..] {
[t] => t.to_string(),
[ts @ .., last] => format!("{} and {last}", ts.join(", ")),
[] => return false,
match listify(&trait_names, |t| t.to_string()) {
Some(names) => names,
None => return false,
}
};
let constraint = constraint.join(" + ");