[rustdoc] Add a test for `--emit=dep-info` for both explicit stdout and implict stdout and explicit file cases

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
64/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Quiet
Tech stack
rust
Domain
build-system, compilers, testing

Research direction

Start by reading the referenced rust-lang/rust#159411 discussion and locate the existing rustdoc tests for --emit=dep-info. Add coverage for explicit stdout, implicit stdout, and an explicit output file, verifying that the generated dependency information includes the sources rustdoc read. Done means all three cases are covered and the tests pass.

Written by the indexing model from the issue text.

Description

T-rustdoc

Quoting https://github.com/rust-lang/rust/pull/159411#issuecomment-5072878151:

Previously, the coverage always went to stdout, so there was no meaningful deps-file to generate. Now that there’s a coverage output, it should depend on all the sources rustdoc read.

Dominant language
Rust
Stars
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Forks
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Avg merge
2d 11h
Merged PRs (30d)
510

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  4. Open a pull request that references the issue number.

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