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                         <h1 id="example-getting-diagnostic-through-rustc_interface"><a class="header" href="#example-getting-diagnostic-through-rustc_interface">Example: Getting diagnostic through <code>rustc_interface</code></a></h1>
 <p>The <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_interface/index.html"><code>rustc_interface</code></a> allows you to intercept diagnostics that would
 otherwise be printed to stderr.</p>
 <h2 id="getting-diagnostics"><a class="header" href="#getting-diagnostics">Getting diagnostics</a></h2>
 <p>To get diagnostics from the compiler,
 configure <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_interface/interface/struct.Config.html"><code>rustc_interface::Config</code></a> to output diagnostic to a buffer,
 and run <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir_typeck/fn.typeck.html"><code>rustc_hir_typeck::typeck</code></a> for each item.</p>
 <pre><pre class="playground"><code class="language-rust">// Tested with nightly-2025-03-28

 #![feature(rustc_private)]

 extern crate rustc_data_structures;
 extern crate rustc_driver;
 extern crate rustc_error_codes;
 extern crate rustc_errors;
 extern crate rustc_hash;
 extern crate rustc_hir;
 extern crate rustc_interface;
 extern crate rustc_session;
 extern crate rustc_span;

 use std::sync::{Arc, Mutex};

 use rustc_errors::emitter::Emitter;
 use rustc_errors::registry::{self, Registry};
 use rustc_errors::translation::Translate;
 use rustc_errors::{DiagInner, FluentBundle};
 use rustc_session::config;
 use rustc_span::source_map::SourceMap;

 struct DebugEmitter {
     source_map: Arc&lt;SourceMap&gt;,
     diagnostics: Arc&lt;Mutex&lt;Vec&lt;DiagInner&gt;&gt;&gt;,
 }

 impl Translate for DebugEmitter {
     fn fluent_bundle(&amp;self) -&gt; Option&lt;&amp;FluentBundle&gt; {
         None
     }

     fn fallback_fluent_bundle(&amp;self) -&gt; &amp;FluentBundle {
         panic!("this emitter should not translate message")
     }
 }

 impl Emitter for DebugEmitter {
     fn emit_diagnostic(&amp;mut self, diag: DiagInner, _: &amp;Registry) {
         self.diagnostics.lock().unwrap().push(diag);
     }

     fn source_map(&amp;self) -&gt; Option&lt;&amp;SourceMap&gt; {
         Some(&amp;self.source_map)
     }
 }

 fn main() {
     let buffer: Arc&lt;Mutex&lt;Vec&lt;DiagInner&gt;&gt;&gt; = Arc::default();
     let diagnostics = buffer.clone();
     let config = rustc_interface::Config {
         opts: config::Options::default(),
         // This program contains a type error.
         input: config::Input::Str {
             name: rustc_span::FileName::Custom("main.rs".into()),
             input: "
 fn main() {
     let x: &amp;str = 1;
 }
 "
             .into(),
         },
         crate_cfg: Vec::new(),
         crate_check_cfg: Vec::new(),
         output_dir: None,
         output_file: None,
         file_loader: None,
         locale_resources: rustc_driver::DEFAULT_LOCALE_RESOURCES.to_owned(),
         lint_caps: rustc_hash::FxHashMap::default(),
         psess_created: Some(Box::new(|parse_sess| {
             parse_sess.dcx().set_emitter(Box::new(DebugEmitter {
                 source_map: parse_sess.clone_source_map(),
                 diagnostics,
             }));
         })),
         register_lints: None,
         override_queries: None,
         registry: registry::Registry::new(rustc_errors::codes::DIAGNOSTICS),
         make_codegen_backend: None,
         expanded_args: Vec::new(),
         ice_file: None,
         hash_untracked_state: None,
         using_internal_features: &amp;rustc_driver::USING_INTERNAL_FEATURES,
     };
     rustc_interface::run_compiler(config, |compiler| {
         let krate = rustc_interface::passes::parse(&amp;compiler.sess);
         rustc_interface::create_and_enter_global_ctxt(&amp;compiler, krate, |tcx| {
             // Iterate all the items defined and perform type checking.
             tcx.par_hir_body_owners(|item_def_id| {
                 tcx.ensure_ok().typeck(item_def_id);
             });
         });
         // If the compiler has encountered errors when this closure returns, it will abort (!) the program.
         // We avoid this by resetting the error count before returning
         compiler.sess.dcx().reset_err_count();
     });
     // Read buffered diagnostics.
     buffer.lock().unwrap().iter().for_each(|diagnostic| {
         println!("{diagnostic:#?}");
     });
 }</code></pre></pre>

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	<h1 id="example-getting-diagnostic-through-rustc_interface"><a class="header" href="#example-getting-diagnostic-through-rustc_interface">Example: Getting diagnostic through <code>rustc_interface</code></a></h1>
	<p>The <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_interface/index.html"><code>rustc_interface</code></a> allows you to intercept diagnostics that would
	otherwise be printed to stderr.</p>
	<h2 id="getting-diagnostics"><a class="header" href="#getting-diagnostics">Getting diagnostics</a></h2>
	<p>To get diagnostics from the compiler,
	configure <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_interface/interface/struct.Config.html"><code>rustc_interface::Config</code></a> to output diagnostic to a buffer,
	and run <a href="https://doc.rust-lang.org/nightly/nightly-rustc/rustc_hir_typeck/fn.typeck.html"><code>rustc_hir_typeck::typeck</code></a> for each item.</p>
	<pre><pre class="playground"><code class="language-rust">// Tested with nightly-2025-03-28

	#![feature(rustc_private)]

	extern crate rustc_data_structures;
	extern crate rustc_driver;
	extern crate rustc_error_codes;
	extern crate rustc_errors;
	extern crate rustc_hash;
	extern crate rustc_hir;
	extern crate rustc_interface;
	extern crate rustc_session;
	extern crate rustc_span;

	use std::sync::{Arc, Mutex};

	use rustc_errors::emitter::Emitter;
	use rustc_errors::registry::{self, Registry};
	use rustc_errors::translation::Translate;
	use rustc_errors::{DiagInner, FluentBundle};
	use rustc_session::config;
	use rustc_span::source_map::SourceMap;

	struct DebugEmitter {
	source_map: Arc<SourceMap>,
	diagnostics: Arc<Mutex<Vec<DiagInner>>>,
	}

	impl Translate for DebugEmitter {
	fn fluent_bundle(&self) -> Option<&FluentBundle> {
	None
	}

	fn fallback_fluent_bundle(&self) -> &FluentBundle {
	panic!("this emitter should not translate message")
	}
	}

	impl Emitter for DebugEmitter {
	fn emit_diagnostic(&mut self, diag: DiagInner, _: &Registry) {
	self.diagnostics.lock().unwrap().push(diag);
	}

	fn source_map(&self) -> Option<&SourceMap> {
	Some(&self.source_map)
	}
	}

	fn main() {
	let buffer: Arc<Mutex<Vec<DiagInner>>> = Arc::default();
	let diagnostics = buffer.clone();
	let config = rustc_interface::Config {
	opts: config::Options::default(),
	// This program contains a type error.
	input: config::Input::Str {
	name: rustc_span::FileName::Custom("main.rs".into()),
	input: "
	fn main() {
	let x: &str = 1;
	}
	"
	.into(),
	},
	crate_cfg: Vec::new(),
	crate_check_cfg: Vec::new(),
	output_dir: None,
	output_file: None,
	file_loader: None,
	locale_resources: rustc_driver::DEFAULT_LOCALE_RESOURCES.to_owned(),
	lint_caps: rustc_hash::FxHashMap::default(),
	psess_created: Some(Box::new(\|parse_sess\| {
	parse_sess.dcx().set_emitter(Box::new(DebugEmitter {
	source_map: parse_sess.clone_source_map(),
	diagnostics,
	}));
	})),
	register_lints: None,
	override_queries: None,
	registry: registry::Registry::new(rustc_errors::codes::DIAGNOSTICS),
	make_codegen_backend: None,
	expanded_args: Vec::new(),
	ice_file: None,
	hash_untracked_state: None,
	using_internal_features: &rustc_driver::USING_INTERNAL_FEATURES,
	};
	rustc_interface::run_compiler(config, \|compiler\| {
	let krate = rustc_interface::passes::parse(&compiler.sess);
	rustc_interface::create_and_enter_global_ctxt(&compiler, krate, \|tcx\| {
	// Iterate all the items defined and perform type checking.
	tcx.par_hir_body_owners(\|item_def_id\| {
	tcx.ensure_ok().typeck(item_def_id);
	});
	});
	// If the compiler has encountered errors when this closure returns, it will abort (!) the program.
	// We avoid this by resetting the error count before returning
	compiler.sess.dcx().reset_err_count();
	});
	// Read buffered diagnostics.
	buffer.lock().unwrap().iter().for_each(\|diagnostic\| {
	println!("{diagnostic:#?}");
	});
	}</code></pre></pre>

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