Delayed CTFE backtraces #54487
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Delayed CTFE backtraces #54487
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(rust_highfive has picked a reviewer for you, use r? to override) |
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r? @oli-obk |
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needs a rebase |
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oh sorry, nevermind. I was sure the other PR was merged :/ |
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…he backtrace delayed The env var is now RUST_CTFE_BACKTRACE. Similar to RUST_BACKTRACE, it usually only prints a backtrace when the error actually surfaces, not when it happens. This makes a difference when we catch errors. As per @oli-obk's request, one can set RUST_CTFE_BACKTRACE=immediate to get the backtrace shown immediately.
No point in making the user also enable RUST_LOG
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Rebased. @oli-obk this is finally ready for review :) |
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@bors r+ |
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📌 Commit 5903fdb has been approved by |
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Oct 28, 2018
Delayed CTFE backtraces This renames the env var that controls CTFE backtraces from `MIRI_BACKTRACE` to `RUST_CTFE_BACKTRACE` so that we can use `MIRI_BACKTRACE` in the miri tool to only show backtraces of the main miri execution. It also makes `RUST_CTFE_BACKTRACE` only show backtraces that actually get rendered as errors, instead of showing them eagerly when the `Err` happens. The current behavior is near useless in miri because it shows about one gazillion backtraces for errors that we later catch and do not care about. However, @oli-obk likes the current behavior for rustc CTFE work so it is still available via `RUST_CTFE_BACKTRACE=immediate`. NOTE: This is based on top of #53821. Only [the last three commits](oli-obk/rust@sanity_query...RalfJung:ctfe-backtrace) are new. Fixes #53355
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☀️ Test successful - status-appveyor, status-travis |
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Thanks. :) Locally, the miri test suite now passes with opt level 3! |
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This renames the env var that controls CTFE backtraces from
MIRI_BACKTRACEtoRUST_CTFE_BACKTRACEso that we can useMIRI_BACKTRACEin the miri tool to only show backtraces of the main miri execution.It also makes
RUST_CTFE_BACKTRACEonly show backtraces that actually get rendered as errors, instead of showing them eagerly when theErrhappens. The current behavior is near useless in miri because it shows about one gazillion backtraces for errors that we later catch and do not care about. However, @oli-obk likes the current behavior for rustc CTFE work so it is still available viaRUST_CTFE_BACKTRACE=immediate.NOTE: This is based on top of #53821. Only the last three commits are new.
Fixes #53355