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Update (2025-02-19):

• To make it easier to follow bootstrap's test flow going into running compiletest-managed test suites, I've added more tracing to bootstrap in bootstrap: add more tracing to compiler/std/llvm flows rust#137080.
• There are some prerequisite cleanups/improvements that I'm working on first to make it easier to read bootstrap + compiletest's codebase for reference: Breakup test.rs into more-manageable sub-modules rust#137224, [compiletest-related cleanups 3/7] Make the distinction between sources root vs test suite sources root in compiletest less confusing rust#136474, [compiletest-related cleanups 4/7] Make the distinction between root build directory vs test suite specific build directory in compiletest less confusing rust#136542
• I'm thinking for the prototype I'm going to experiment with a branch off of rust-lang/rust instead of completely separately, so I can experiment under the context of bootstrap and tests that we actually have, instead of trying to experiment with it in a complete vacuum (esp. with respect to staging and dependency licenses).
  • Onur is working on stabilize stage management for rustc tools #137215 which I will wait on to match ToolStd behavior as used by compiletest.

Update (2025-02-27):

• Cleanups still waiting to be merged (some PRs are blocked on changes from others making this slow).

Update (2025-03-15):

• Doing a survey pass on compiletest to make sure I have the full picture.