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rustc-dev-guide/src/rustc-driver/getting-diagnostics.md

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Example: Getting diagnostic through rustc_interface

The rustc_interface allows you to intercept diagnostics that would otherwise be printed to stderr.

Getting diagnostics

To get diagnostics from the compiler, configure rustc_interface::Config to output diagnostic to a buffer, and run TyCtxt.analysis. The following was tested with nightly-2024-09-16:

{{#include ../../examples/rustc-interface-getting-diagnostics.rs}}