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To make the code easier to understand.
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This reverts commit 8a568d9f15453cbfe5d6f45fa5f5bb32e58b93ed.
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```
error[E0277]: the trait bound `dep_2_reexport::Type: Trait` is not satisfied because the trait comes from a different crate version
--> multiple-dep-versions.rs:7:18
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7 | do_something(Type);
| ^^^^ the trait `Trait` is not implemented for `dep_2_reexport::Type`
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note: there are multiple different versions of crate `dependency` in the dependency graph
--> /home/gh-estebank/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-1.rs:4:1
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3 | pub struct Type(pub i32);
| --------------- this type implements the required trait
4 | pub trait Trait {
| ^^^^^^^^^^^^^^^ this is the required trait
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::: multiple-dep-versions.rs:1:1
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1 | extern crate dep_2_reexport;
| ---------------------------- one version of crate `dependency` is used here, as a dependency of crate `foo`
2 | extern crate dependency;
| ------------------------ one version of crate `dependency` is used here, as a direct dependency of the current crate
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::: /home/gh-estebank/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-2.rs:3:1
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3 | pub struct Type;
| --------------- this type doesn't implement the required trait
4 | pub trait Trait {
| --------------- this is the found trait
= note: two types coming from two different versions of the same crate are different types even if they look the same
= help: you can use `cargo tree` to explore your dependency tree
```
The approach to accomplish this is a HACK, and we'd want a better way to do this. I believe that moving E0277 to be a structured diagnostic would help in that regard.
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```
error[E0277]: the trait bound `dep_2_reexport::Type: Trait` is not satisfied because the trait comes from a different crate version
--> multiple-dep-versions.rs:7:18
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7 | do_something(Type);
| ^^^^ the trait `Trait` is not implemented for `dep_2_reexport::Type`
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note: there are multiple different versions of crate `dependency` in the dependency graph
--> /home/gh-estebank/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-1.rs:4:1
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3 | pub struct Type(pub i32);
| --------------- this type implements the required trait
4 | pub trait Trait {
| ^^^^^^^^^^^^^^^ this is the required trait
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::: multiple-dep-versions.rs:1:1
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1 | extern crate dep_2_reexport;
| ---------------------------- one version of crate `dependency` is used here, as a dependency of crate `foo`
2 | extern crate dependency;
| ------------------------ one version of crate `dependency` is used here, as a direct dependency of the current crate
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::: /home/gh-estebank/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-2.rs:3:1
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3 | pub struct Type;
| --------------- this type doesn't implement the required trait
4 | pub trait Trait {
| --------------- this is the found trait
= note: two types coming from two different versions of the same crate are different types even if they look the same
= help: you can use `cargo tree` to explore your dependency tree
note: required by a bound in `do_something`
--> /home/gh-estebank/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-1.rs:12:24
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12 | pub fn do_something<X: Trait>(_: X) {}
| ^^^^^ required by this bound in `do_something`
```
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Previously, we only emitted the additional context if the type was in the same crate as the trait that appeared multiple times in the dependency tree. Now, we look at all traits looking for two with the same name in different crates with the same crate number, and we are more flexible looking for the types involved. This will work even if the type that implements the wrong trait version is from a different crate entirely.
```
error[E0277]: the trait bound `CustomErrorHandler: ErrorHandler` is not satisfied
--> src/main.rs:5:17
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5 | cnb_runtime(CustomErrorHandler {});
| ----------- ^^^^^^^^^^^^^^^^^^^^^ the trait `ErrorHandler` is not implemented for `CustomErrorHandler`
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| required by a bound introduced by this call
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help: you have multiple different versions of crate `c` in your dependency graph
--> src/main.rs:1:5
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1 | use b::CustomErrorHandler;
| ^ one version of crate `c` is used here, as a dependency of crate `b`
2 | use c::cnb_runtime;
| ^ one version of crate `c` 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/testcase-rustc-crate-version-mismatch/c-v0.2/src/lib.rs:1:1
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1 | pub trait ErrorHandler {}
| ^^^^^^^^^^^^^^^^^^^^^^ this is the required trait
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::: /home/gh-estebank/testcase-rustc-crate-version-mismatch/b/src/lib.rs:1:1
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1 | pub struct CustomErrorHandler {}
| ----------------------------- this type doesn't implement the required trait
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::: /home/gh-estebank/testcase-rustc-crate-version-mismatch/c-v0.1/src/lib.rs:1:1
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1 | pub trait ErrorHandler {}
| ---------------------- this is the found trait
= help: you can use `cargo tree` to explore your dependency tree
note: required by a bound in `cnb_runtime`
--> /home/gh-estebank/testcase-rustc-crate-version-mismatch/c-v0.2/src/lib.rs:3:41
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3 | pub fn cnb_runtime(_error_handler: impl ErrorHandler) {}
| ^^^^^^^^^^^^ required by this bound in `cnb_runtime`
```
Fix #89143.
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Make checking slightly cheaper (by restricting to the right item only).
Add tests.
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When a type comes indirectly from one crate version but the imported trait comes from a separate crate version, the called method won't be found. We now show additional context:
```
error[E0599]: no method named `foo` found for struct `dep_2_reexport::Type` in the current scope
--> multiple-dep-versions.rs:8:10
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8 | Type.foo();
| ^^^ method not found in `Type`
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note: you have multiple different versions of crate `dependency` in your dependency graph
--> multiple-dep-versions.rs:4:32
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4 | use dependency::{do_something, Trait};
| ^^^^^ `dependency` imported here doesn't correspond to the right crate version
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::: ~/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-1.rs:4:1
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4 | pub trait Trait {
| --------------- this is the trait that was imported
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::: ~/rust/build/x86_64-unknown-linux-gnu/test/run-make/crate-loading/rmake_out/multiple-dep-versions-2.rs:4:1
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4 | pub trait Trait {
| --------------- this is the trait that is needed
5 | fn foo(&self);
| --- the method is available for `dep_2_reexport::Type` here
```
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