Replace truncate(0) with clear()

[xtqqczze]

No description provided.

[rustbot]

rust-analyzer is developed in its own repository. If possible, consider making this change to rust-lang/rust-analyzer instead.

cc @rust-lang/rust-analyzer

Some changes occurred in src/tools/compiletest

cc @jieyouxu

[rustbot]

r? @joboet

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They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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Why was this reviewer chosen?

The reviewer was selected based on:

• Owners of files modified in this PR: @ChrisDenton, libs
• @ChrisDenton, libs expanded to 8 candidates
• Random selection from Mark-Simulacrum, joboet

[bjorn3]

Please don't modify subtrees like rust-analyzer inside the rust-lang/rust repo unless necessary. Development of rust-analyzer happens at https://github.com/rust-lang/rust-analyzer/

[xtqqczze]

rebased

For future reference do all subtrees have a josh-sync.toml?

[bjorn3]

Most do. The exceptions I believe are compiler/rustc_codegen_cranelift, compiler/rustc_codegen_gcc and src/tools/rustfmt. Those I think are the only ones that still use git-subtree rather than josh for syncing.

[xtqqczze]

Right, unfortunately there is no reliable method get a list of current subtrees from Git. Perhaps these could be tracked explicitly somewhere?

[lnicola]

No need to, just see if triagebot complains. You can skim https://github.com/rust-lang/rust/blob/main/triagebot.toml if you're wondering.

[Kivooeo]

approve on compiler/ part, yet requires an approve on library/ part

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