Two different versions of a crate interacting leads to unhelpful error messages #22750

huonw · 2015-02-24T06:18:29Z

https://github.com/huonw/bad-error-messages-a contains a crate a. https://github.com/huonw/bad-error-messages-bc contains two crates, b and c.

a contains a trait Foo and a function test that requires that trait.
b depends on a specific revision (8b532f5, not the HEAD) of a and contains a type Bar that implements a::Foo.
c depends on a's HEAD (happens to be 84cfe230) and b, and tries to use b::Bar with a::test.

c fails to compile despite Bar "clearly" implementing Foo... it's even displayed in the docs!

Cloning https://github.com/huonw/bad-error-messages-bc and running cargo build in the root (which is c) gives

   Compiling a v0.0.1 (https://github.com/huonw/bad-error-messages-a#84cfe230)
   Compiling a v0.0.1 (https://github.com/huonw/bad-error-messages-a?rev=8b532f5#8b532f51)
   Compiling b v0.0.1 (file:///home/huon/projects/test-rust/error-messages/c)
   Compiling c v0.0.1 (file:///home/huon/projects/test-rust/error-messages/c)
src/lib.rs:5:5: 5:12 error: the trait `a::Foo` is not implemented for the type `b::Bar` [E0277]
src/lib.rs:5     a::test(b::Bar);
                 ^~~~~~~
error: aborting due to previous error

There's no indication of the fundamental problem from either rustdoc or rustc: that there's two different versions of a being used, meaning a#84cfe230::Foo and a#8b532f5::Foo are different. Bar only implements the latter, but in c, the name a refers to a#84cfe230 so a::test(...) requires the former. (Using name#rev to represent the crate with that version.)

There is an indication of the difference in the example above, since a is compiled twice, but that comes from cargo, not rustc. This issue is focusing on the fact that rustc itself does not give helpful errors and/or allow tools like cargo to control those errors.

It would be nice if rustc:

disambiguated ambiguous names, probably by filepath/name by default
allowed cargo to specify semantically relevant info for the disambiguation e.g. pass in the version/revision/..., so that rustc can print foo#0.2.3 instead of the filepath/name
detected errors that may be caused by ambiguous names and noted it explicitly, e.g. when there is a error involving an ambiguous crate print (once) some extra lines like "note: there's multiple versions of crate ... in use": along with a listing of the possibilities.

(NB. I've used cargo to construct this example because it is the easiest way I can get two different versions of a crate. This appears in rust-lang/rust's makefiles too, where the std test runner is called "std" internally, but links against another crate called "std", i.e. the conventional standard library.)

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Hoverbear · 2015-02-24T06:20:11Z

This bit me today with uuid! It took me a few minutes before I even understood that it wasn't "my" code that was giving this off.

Kimundi · 2015-02-27T21:59:13Z

Related, its also annoying if only crate local paths get emitted, like in backtraces.

We need a way for crates to identify themself uniquely, and not just by an identifier. Maybe a scheme like <crate foo #ef12f212>::bar::baz?

golddranks · 2015-03-10T14:29:02Z

I was bitten by this too.

Kimundi: Agreed for the need to unique identification. But then again, in some cases the local path tells more directly where the problem is. I wonder if there are cases where path is better and cases where a hash is better. Or maybe some kind of hybrid: If version information from cargo is available, use that. If not, if version control information is available, use commit SHA, and if no other information exists, use a path...?

huonw · 2015-09-08T00:58:02Z

Nominating for high priority. I think this is one of the main pain points people have when using cargo, and one of the major reasons for people complaining about cargo allowing multiple versions of a crate. It's usually easy to identify once you've seen it a few times, but it is a horribly confusing and annoying experience.

(Tagged with both compiler and tools since cargo presumably plays into this, but this is probably most relevant to the compiler subteam.)

@golddranks: the question of connecting semantically relevant info to crates is discussed a little in the issue. I think the best plan would external tools to pass in arbitrary strings connected to each crate, defaulting to the path, meaning rustc doesn't have to actually understand anything, just print strings (the compiler already has an --extern NAME=PATH argument that tools like cargo use, it could be extended to also allow --extern NAME#"ID"=PATH or something).

steveklabnik · 2015-09-08T02:16:58Z

I've also seen an increasing number of IRC questions about this.

On Sep 7, 2015, at 20:58, Huon Wilson [email protected] wrote:

Nominating for high priority. I think this is one of the main pain points people have when using cargo, and one of the major reasons for people complaining about cargo allowing multiple versions of a crate. It's usually easy to identify once you've seen it a few times, but it is a horribly confusing and annoying experience.

(Tagged with both compiler and tools since cargo presumably plays into this, but this is probably most relevant to the compiler subteam.)

@golddranks: the question of connecting semantically relevant info to crates is discussed a little in the issue. I think the best plan would external tools to pass in arbitrary strings connected to each crate, defaulting to the path, meaning rustc doesn't have to actually understand anything, just print strings (the compiler already has an --extern NAME=PATH argument that tools like cargo use, it could be extended to also allow --extern NAME#"ID"=PATH or something).

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Manishearth · 2015-09-08T02:18:17Z

I'll take a crack at this

Manishearth · 2015-09-08T03:14:45Z

I think at the very least, for mismatched type and unimplemented trait errors, if we detect a crate mismatch, we should mention it. Any other such errors?

steveklabnik · 2015-09-08T13:37:58Z

Mismatched type is the big one.

Being able to understand this would also help Rustdoc a lot, I think there are bugs open. (That way, we could know if something is a re-export or not)

…m two different crate of the same name (rust-lang#22750)

@eddyb

Partially fixes #22750 I'll write a test for this when I figure out how to. r? @eddyb cc @steveklabnik

Manishearth · 2015-09-09T13:42:48Z

No no no github, I said "partial fix"

Manishearth · 2015-09-09T13:43:25Z

Anyway, #28300 fixes the error when there's a type mismatch. "Can't find trait" will be a tad trickier

hexsel · 2015-09-09T13:52:41Z

I had a corner-case posted on Reddit that was even more confusing:

src/main.rs:9:45: 9:47 error: mismatched types:
 expected `&cookie::jar::CookieJar<'_>`,
 found `&cookie::jar::CookieJar<'_>`

I was using Hyper with the latest cookie crate. I did it because even though 'hyper' depends on 'cookie=0.1.21' or somesuch, I couldn't use 'cookie' on my program. I'll suggest a change on cargo if it doesn't yet exist.

Manishearth · 2015-09-09T13:53:59Z

Yeah, this should be fixed but the just-landed PR.

nikomatsakis · 2015-09-17T20:26:21Z

triage: P-medium -- we think that the most important cases here have been covered. If this issue continues to arise frequently on IRC, we could bump up the priority to high.

Kixunil · 2020-06-19T13:57:54Z

@robinmoussu I just noticed cargo tree has -d switch. In that case, the switch should be suggested as well.

edmorley · 2021-09-21T09:15:53Z

I have another "trait not implemented" variation that isn't fixed by #66561 and doesn't seem to be similar to the previously mentioned testcases - I've filed it as #89143.

…imulacrum Add note for mismatched types because of circular dependencies If you have crate A with a dependency on crate B, and crate B with a dev-dependency on A, then you might see "mismatched types" errors on types that seem to be equal. This PR adds a note that explains that the types are different, because crate B is compiled twice, one time with `cfg(test)` and one time without. I haven't found a good way to create circular dependencies in UI tests, so I abused the incremental tests instead. As a bonus, incremental tests support "cpass" now. related to rust-lang#22750

Allen-Webb · 2023-05-10T14:37:17Z

I was helping someone troubleshoot a subcase of this and followed up with https://internals.rust-lang.org/t/better-error-when-trait-not-implemented-because-of-different-crate-version/18808. #73560 seems to do a good job of covering the case I ran into and it looks like a subcase of this issue.

estebank · 2023-10-17T23:56:19Z

cc rust-lang/compiler-team#635

When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

…fee1-dead On trait bound mismatch, detect multiple crate versions in dep tree When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

…<try> On trait bound mismatch, detect multiple crate versions in dep tree When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

…r=fee1-dead On trait bound mismatch, detect multiple crate versions in dep tree When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

…r=fee1-dead On trait bound mismatch, detect multiple crate versions in dep tree When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

…r=fee1-dead On trait bound mismatch, detect multiple crate versions in dep tree When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

Rollup merge of rust-lang#124944 - estebank:multiple-crate-versions, r=fee1-dead On trait bound mismatch, detect multiple crate versions in dep tree When encountering an E0277, if the type and the trait both come from a crate with the same name but different crate number, we explain that there are multiple crate versions in the dependency tree. If there's a type that fulfills the bound, and it has the same name as the passed in type and has the same crate name, we explain that the same type in two different versions of the same crate *are different*. ``` error[E0277]: the trait bound `Type: dependency::Trait` is not satisfied --> src/main.rs:4:18 | 4 | do_something(Type); | ------------ ^^^^ the trait `dependency::Trait` is not implemented for `Type` | | | required by a bound introduced by this call | help: you have multiple different versions of crate `dependency` in your dependency graph --> src/main.rs:1:5 | 1 | use bar::do_something; | ^^^ one version of crate `dependency` is used here, as a dependency of crate `bar` 2 | use dependency::Type; | ^^^^^^^^^^ one version of crate `dependency` is used here, as a direct dependency of the current crate note: two types coming from two different versions of the same crate are different types even if they look the same --> /home/gh-estebank/crate_versions/baz-2/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type doesn't implement the required trait | ::: /home/gh-estebank/crate_versions/baz/src/lib.rs:1:1 | 1 | pub struct Type; | ^^^^^^^^^^^^^^^ this type implements the required trait 2 | pub trait Trait {} | --------------- this is the required trait note: required by a bound in `bar::do_something` --> /home/gh-estebank/crate_versions/baz/src/lib.rs:4:24 | 4 | pub fn do_something<X: Trait>(_: X) {} | ^^^^^ required by this bound in `do_something` ``` Address rust-lang#22750.

estebank · 2024-11-29T22:56:05Z

Current output in nightly:

error[E0277]: the trait bound `Bar: Foo` is not satisfied
 --> src/lib.rs:5:13
  |
5 |     a::test(b::Bar);
  |     ------- ^^^^^^ the trait `Foo` is not implemented for `Bar`
  |     |
  |     required by a bound introduced by this call
  |
note: there are multiple different versions of crate `a` in the dependency graph
 --> /home/gh-estebank/.cargo/git/checkouts/bad-error-messages-a-9469deda810eeb82/84cfe23/src/lib.rs:3:1
  |
3 | pub trait Foo {
  | ^^^^^^^^^^^^^ this is the required trait
  |
 ::: src/lib.rs:1:1
  |
1 | extern crate a;
  | --------------- one version of crate `a` is used here, as a direct dependency of the current crate
2 | extern crate b;
  | --------------- one version of crate `a` is used here, as a dependency of crate `b`
  |
 ::: /home/gh-estebank/bad-error-messages-bc/b/src/lib.rs:3:1
  |
3 | pub struct Bar;
  | -------------- this type doesn't implement the required trait
  |
 ::: /home/gh-estebank/.cargo/git/checkouts/bad-error-messages-a-9469deda810eeb82/8b532f5/src/lib.rs:2:1
  |
2 | pub trait Foo {
  | ------------- this is the found trait
  = help: you can use `cargo tree` to explore your dependency tree
note: required by a bound in `test`
 --> /home/gh-estebank/.cargo/git/checkouts/bad-error-messages-a-9469deda810eeb82/84cfe23/src/lib.rs:1:16
  |
1 | pub fn test<T: Foo>(_: T) {}
  |                ^^^ required by this bound in `test`

huonw added the A-diagnostics Area: Messages for errors, warnings, and lints label Feb 24, 2015

ghost mentioned this issue Mar 10, 2015

Confusing "type mismatch" error report: the types might differ while pretty-printer prints them in exactly the same way #23252

Closed

sfackler mentioned this issue Jun 12, 2015

Error about "different enum" could be more helpful #26236

Closed

alexcrichton mentioned this issue Aug 4, 2015

[wish list] Confusing error message E0308 when using two diff versions of a library #27420

Closed

huonw added T-tools T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Sep 8, 2015

Manishearth self-assigned this Sep 8, 2015

Manishearth added a commit to Manishearth/rust that referenced this issue Sep 8, 2015

Add note for when a type error comes from similarly named objects fro…

8b16eb8

…m two different crate of the same name (rust-lang#22750)

Manishearth mentioned this issue Sep 8, 2015

Add note for possible crate mismatches in type errors #28300

Merged

bors added a commit that referenced this issue Sep 9, 2015

Auto merge of #28300 - Manishearth:crate_err, r=eddyb

7c8ae60

Partially fixes #22750 I'll write a test for this when I figure out how to. r? @eddyb cc @steveklabnik

bors closed this as completed in #28300 Sep 9, 2015

Manishearth reopened this Sep 9, 2015

rust-highfive added P-medium Medium priority and removed I-nominated labels Sep 17, 2015

Kimundi mentioned this issue Sep 21, 2015

Improve the remaining rough corners of the module system rust-lang/rfcs#1289

Open

alexcrichton removed the T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. label Jan 27, 2016

glindstedt mentioned this issue Nov 7, 2020

Export FmcSdramConfiguration and FmcSdramTiming structs stm32-rs/stm32-fmc#2

Merged

jturner314 mentioned this issue Dec 27, 2020

ndarray_rand: random_using() compilation error rust-ndarray/ndarray#875

Closed

JorgeMrtnzG mentioned this issue Feb 5, 2021

Could not convert to geojson::Geometry georust/geos#81

Closed

vks mentioned this issue Apr 13, 2021

Update to rand >= 0.8 statrs-dev/statrs#133

Closed

This was referenced Sep 20, 2021

ErrorHandler trait not implemented errors after new major version releases of libcnb heroku/libcnb.rs#90

Closed

Crate version mismatch suggestion not being shown for trait not implemented error #89143

Closed

memoryruins mentioned this issue Oct 10, 2022

Warn when two crates with different versions are in use in the same compilation unit #102882

Closed

lukas-code mentioned this issue Dec 16, 2022

Add note for mismatched types because of circular dependencies #105793

Merged

jyn514 added the D-crate-version-mismatch Diagnostics: Errors or lints caused be the use of two different crate versions. label Apr 25, 2023

estebank mentioned this issue May 9, 2024

On trait bound mismatch, detect multiple crate versions in dep tree #124944

Merged

estebank closed this as completed Nov 29, 2024

Two different versions of a crate interacting leads to unhelpful error messages #22750

Two different versions of a crate interacting leads to unhelpful error messages #22750

Comments

huonw commented Feb 24, 2015

Hoverbear commented Feb 24, 2015

Uh oh!

Kimundi commented Feb 27, 2015

Uh oh!

golddranks commented Mar 10, 2015 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

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huonw commented Sep 8, 2015

Uh oh!

steveklabnik commented Sep 8, 2015

Uh oh!

Manishearth commented Sep 8, 2015

Uh oh!

Manishearth commented Sep 8, 2015

Uh oh!

steveklabnik commented Sep 8, 2015

Uh oh!

Manishearth commented Sep 9, 2015

Uh oh!

Manishearth commented Sep 9, 2015

Uh oh!

hexsel commented Sep 9, 2015

Uh oh!

Manishearth commented Sep 9, 2015

Uh oh!

nikomatsakis commented Sep 17, 2015

Uh oh!

Kixunil commented Jun 19, 2020

Uh oh!

edmorley commented Sep 21, 2021

Uh oh!

Allen-Webb commented May 10, 2023

Uh oh!

estebank commented Oct 17, 2023

Uh oh!

estebank commented Nov 29, 2024

Uh oh!

golddranks commented Mar 10, 2015 •

edited

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