Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Don't eagerly convert principal to string #108162

Merged
merged 1 commit into from
Feb 18, 2023
Merged
Show file tree
Hide file tree
Changes from all commits
Commits
File filter

Filter by extension

Filter by extension

Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion compiler/rustc_lint/src/deref_into_dyn_supertrait.rs
Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ impl<'tcx> LateLintPass<'tcx> for DerefIntoDynSupertrait {
});
cx.emit_spanned_lint(DEREF_INTO_DYN_SUPERTRAIT, cx.tcx.def_span(item.owner_id.def_id), SupertraitAsDerefTarget {
t,
target_principal: target_principal.to_string(),
target_principal,
label,
});
}
Expand Down
5 changes: 2 additions & 3 deletions compiler/rustc_lint/src/lints.rs
Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,7 @@ use rustc_errors::{
};
use rustc_hir::def_id::DefId;
use rustc_macros::{LintDiagnostic, Subdiagnostic};
use rustc_middle::ty::{Predicate, Ty, TyCtxt};
use rustc_middle::ty::{PolyExistentialTraitRef, Predicate, Ty, TyCtxt};
use rustc_session::parse::ParseSess;
use rustc_span::{edition::Edition, sym, symbol::Ident, Span, Symbol};

Expand Down Expand Up @@ -556,8 +556,7 @@ pub struct BuiltinUnexpectedCliConfigValue {
#[diag(lint_supertrait_as_deref_target)]
pub struct SupertraitAsDerefTarget<'a> {
pub t: Ty<'a>,
pub target_principal: String,
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Now I wonder whether it ever makes sense to store a String in a lint diagnostic or whether it would make more sense for the derive to error when it sees a String. Might be worth trying out and seeing what happens.

// pub target_principal: Binder<'a, ExistentialTraitRef<'b>>,
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

commented out code, on my master 😰

pub target_principal: PolyExistentialTraitRef<'a>,
#[subdiagnostic]
pub label: Option<SupertraitAsDerefTargetLabel>,
}
Expand Down
6 changes: 6 additions & 0 deletions compiler/rustc_middle/src/ty/sty.rs
Original file line number Diff line number Diff line change
Expand Up @@ -933,6 +933,12 @@ impl<'tcx> PolyExistentialTraitRef<'tcx> {
}
}

impl rustc_errors::IntoDiagnosticArg for PolyExistentialTraitRef<'_> {
fn into_diagnostic_arg(self) -> rustc_errors::DiagnosticArgValue<'static> {
self.to_string().into_diagnostic_arg()
compiler-errors marked this conversation as resolved.
Show resolved Hide resolved
}
}

#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, TyEncodable, TyDecodable)]
#[derive(HashStable)]
pub enum BoundVariableKind {
Expand Down
15 changes: 15 additions & 0 deletions tests/ui/lint/issue-108155.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
// check-pass
// check that `deref_into_dyn_supertrait` doesn't cause ICE by eagerly converting
// a cancelled lint

#![allow(deref_into_dyn_supertrait)]

trait Trait {}
impl std::ops::Deref for dyn Trait + Send + Sync {
type Target = dyn Trait;
fn deref(&self) -> &Self::Target {
self
}
}

fn main() {}