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Conflicting implementations with <code>fn_traits</code> and <code>From</code>

A-trait-systemArea: Trait systemArea: Trait system

C-bugCategory: This is a bug.Category: This is a bug.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#142037 In rust-lang/rust;

· Nobody-alias-N opened on Jun 4, 2025

ICE: <code>encountered type variable</code>

A-closuresArea: Closures (`|…| { … }`)Area: Closures (`|…| { … }`)

C-bugCategory: This is a bug.Category: This is a bug.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

S-bug-has-testStatus: This bug is tracked inside the repo by a `known-bug` test.Status: This bug is tracked inside the repo by a `known-bug` test.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#131758 In rust-lang/rust;

· matthiaskrgr opened on Oct 15, 2024

Rules around call resolution on <code>fn_traits</code> are confusing

C-discussionCategory: Discussion or questions that doesn't represent real issues.Category: Discussion or questions that doesn't represent real issues.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#120022 In rust-lang/rust;

· Kolsky opened on Jan 16, 2024

ICE: <code>unboxed closure</code> but only with <code>mir-opt-level=0</code>

C-bugCategory: This is a bug.Category: This is a bug.

E-needs-testCall for participation: An issue has been fixed and does not reproduce, but no test has been added.Call for participation: An issue has been fixed and does not reproduce, but no test has been added.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

I-ICEIssue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#114665 In rust-lang/rust;

· matthiaskrgr opened on Aug 9, 2023

Custom Fn* trait implementation doesn't properly fallback from Fn to FnMut, or FnMut to FnOnce

C-bugCategory: This is a bug.Category: This is a bug.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#89032 In rust-lang/rust;

· wwylele opened on Sep 17, 2021

Specialized <code>FnOnce</code> impl compiles failed with a lengthy error message

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

A-specializationArea: Trait impl specializationArea: Trait impl specialization

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

F-specialization`#![feature(specialization)]``#![feature(specialization)]`

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

requires-nightlyThis issue requires a nightly compiler in some way.This issue requires a nightly compiler in some way.

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#58809 In rust-lang/rust;

· mzji opened on Feb 28, 2019

Cannot call implementations of the <code>Fn*</code> traits on references

A-type-systemArea: Type systemArea: Type system

C-bugCategory: This is a bug.Category: This is a bug.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

P-mediumMedium priorityMedium priority

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

T-typesRelevant to the types team, which will review and decide on the PR/issue.Relevant to the types team, which will review and decide on the PR/issue.

Status: Open.

#42736 In rust-lang/rust;

· shepmaster opened on Jun 18, 2017

<code>rust-call</code> call ABI is not feature gated at call-sites

A-stabilityArea: `#[stable]`, `#[unstable]` etc.Area: `#[stable]`, `#[unstable]` etc.

C-bugCategory: This is a bug.Category: This is a bug.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

P-mediumMedium priorityMedium priority

T-langRelevant to the language teamRelevant to the language team

Status: Open.

#34901 In rust-lang/rust;

· pnkfelix opened on Jul 18, 2016

Struct and variant constructors are not generic over lifetimes like regular functions.

A-lifetimesArea: Lifetimes / regionsArea: Lifetimes / regions

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#30904 In rust-lang/rust;

· eddyb opened on Jan 14, 2016

Tracking issue for Fn traits (<code>unboxed_closures</code> &amp; <code>fn_traits</code> feature)

B-RFC-implementedBlocker: Approved by a merged RFC and implemented but not stabilized.Blocker: Approved by a merged RFC and implemented but not stabilized.

B-unstableBlocker: Implemented in the nightly compiler and unstable.Blocker: Implemented in the nightly compiler and unstable.

C-tracking-issueCategory: An issue tracking the progress of sth. like the implementation of an RFCCategory: An issue tracking the progress of sth. like the implementation of an RFC

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

S-tracking-design-concernsStatus: There are blocking design concerns.Status: There are blocking design concerns.

T-langRelevant to the language teamRelevant to the language team

T-libs-apiRelevant to the library API team, which will review and decide on the PR/issue.Relevant to the library API team, which will review and decide on the PR/issue.

Status: Open.

#29625 In rust-lang/rust;

· aturon opened on Nov 5, 2015

type parameter not constrained when using closure bounds

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

C-enhancementCategory: An issue proposing an enhancement or a PR with one.Category: An issue proposing an enhancement or a PR with one.

D-confusingDiagnostics: Confusing error or lint that should be reworked.Diagnostics: Confusing error or lint that should be reworked.

D-newcomer-roadblockDiagnostics: Confusing error or lint; hard to understand for new users.Diagnostics: Confusing error or lint; hard to understand for new users.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#25041 In rust-lang/rust;

· BurntSushi opened on May 2, 2015

Unexpected trait behavior with default_type_params

A-closuresArea: Closures (`|…| { … }`)Area: Closures (`|…| { … }`)

A-diagnosticsArea: Messages for errors, warnings, and lintsArea: Messages for errors, warnings, and lints

C-bugCategory: This is a bug.Category: This is a bug.

F-unboxed_closures`#![feature(unboxed_closures)]``#![feature(unboxed_closures)]`

T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.Relevant to the compiler team, which will review and decide on the PR/issue.

Status: Open.

#18754 In rust-lang/rust;

· carllerche opened on Nov 7, 2014