Error message when trying to remove a typo'd dependency could be clearer

[Seercat3160]

Problem

When using cargo remove, specifying a dependency name that is not present in Cargo.toml results in an error message suggesting the "closest" package by name.

Currently, if foo is a dependency:

$ cargo remove fo
    Removing fo from dependencies
error: the dependency `fo` could not be found in `dependencies`; dependency `foo` exists

The "dependency foo exists" part is unclear, particularly if the crate name is longer and the typo in the command is not noticed right away.
It comes from

cargo/src/cargo/util/toml_mut/manifest.rs

Line 686 in 6d1bd93

msg.push_str(&format!("; dependency `{alt_name}` exists",));

Proposed Solution

Option 1

Change the message to something such as "Did you mean...?"

$ cargo remove fo
    Removing fo from dependencies
error: the dependency `fo` could not be found in `dependencies`; Did you mean `foo`?

Option 2

Use closest_msg

$ cargo remove fo
    Removing fo from dependencies
error: the dependency `fo` could not be found in `dependencies`
help: a dependency with a similar name exists: foo

Notes

Option 2 is closer to the compiler's message if you typo a variable name.

[weihanglo]

Thanks for the issue report!

Option 2 sounds good to me, as we are (slowly) migrating to rustc style diagnostics: #15944.

Probably one line above could also be changed to the rustc style

cargo/src/cargo/util/toml_mut/manifest.rs

Line 684 in 6d1bd93

msg.push_str(&format!("; it is present in `{found_table}`",));

@rustbot label -S-triage +S-accepted +A-diagnostics +Command-add