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clarify must_produce_diag
ICE for debugging
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@ -623,12 +623,25 @@ impl Drop for DiagCtxtInner {
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self.flush_delayed()
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}
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// Sanity check: did we use some of the expensive `trimmed_def_paths` functions
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// unexpectedly, that is, without producing diagnostics? If so, for debugging purposes, we
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// suggest where this happened and how to avoid it.
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if !self.has_printed && !self.suppressed_expected_diag && !std::thread::panicking() {
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if let Some(backtrace) = &self.must_produce_diag {
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let suggestion = match backtrace.status() {
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BacktraceStatus::Disabled => String::from(
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"Backtraces are currently disabled: set `RUST_BACKTRACE=1` and re-run \
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to see where it happened.",
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),
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BacktraceStatus::Captured => format!(
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"This happened in the following `must_produce_diag` call's backtrace:\n\
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{backtrace}",
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),
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_ => String::from("(impossible to capture backtrace where this happened)"),
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};
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panic!(
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"must_produce_diag: `trimmed_def_paths` called but no diagnostics emitted; \
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`with_no_trimmed_paths` for debugging. \
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called at: {backtrace}"
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"`trimmed_def_paths` called, diagnostics were expected but none were emitted. \
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Use `with_no_trimmed_paths` for debugging. {suggestion}"
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);
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}
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}
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