save_analysis: Migrate diagnostics

Cargo.lock

@@ -4421,9 +4421,11 @@ dependencies = [
  "rustc_ast",
  "rustc_ast_pretty",
  "rustc_data_structures",
+ "rustc_errors",
  "rustc_hir",
  "rustc_hir_pretty",
  "rustc_lexer",
+ "rustc_macros",
  "rustc_middle",
  "rustc_session",
  "rustc_span",

compiler/rustc_error_messages/locales/en-US/save_analysis.ftl

@@ -0,0 +1 @@
+save_analysis_could_not_open = Could not open `{$file_name}`: `{$err}`

compiler/rustc_error_messages/src/lib.rs

@@ -43,6 +43,7 @@ fluent_messages! {
     passes => "../locales/en-US/passes.ftl",
     plugin_impl => "../locales/en-US/plugin_impl.ftl",
     privacy => "../locales/en-US/privacy.ftl",
+    save_analysis => "../locales/en-US/save_analysis.ftl",
     typeck => "../locales/en-US/typeck.ftl",
 }
 

compiler/rustc_save_analysis/Cargo.toml

@@ -9,9 +9,11 @@ rustc_middle = { path = "../rustc_middle" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_ast_pretty = { path = "../rustc_ast_pretty" }
 rustc_data_structures = { path = "../rustc_data_structures" }
+rustc_errors = { path = "../rustc_errors" }
 rustc_hir = { path = "../rustc_hir" }
 rustc_hir_pretty = { path = "../rustc_hir_pretty" }
 rustc_lexer = { path = "../rustc_lexer" }
+rustc_macros = { path = "../rustc_macros" }
 serde_json = "1"
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }

compiler/rustc_save_analysis/src/errors.rs

@@ -0,0 +1,10 @@
+use rustc_macros::SessionDiagnostic;
+
+use std::path::Path;
+
+#[derive(SessionDiagnostic)]
+#[diag(save_analysis::could_not_open)]
+pub(crate) struct CouldNotOpen<'a> {
+    pub file_name: &'a Path,
+    pub err: std::io::Error,
+}

compiler/rustc_save_analysis/src/lib.rs

@@ -3,11 +3,15 @@
 #![feature(let_else)]
 #![recursion_limit = "256"]
 #![allow(rustc::potential_query_instability)]
+#![feature(never_type)]
+#![deny(rustc::untranslatable_diagnostic)]
+#![deny(rustc::diagnostic_outside_of_impl)]
 
 mod dump_visitor;
 mod dumper;
 #[macro_use]
 mod span_utils;
+mod errors;
 mod sig;
 
 use rustc_ast as ast;
@@ -928,7 +932,7 @@ impl<'a> DumpHandler<'a> {
         info!("Writing output to {}", file_name.display());
 
         let output_file = BufWriter::new(File::create(&file_name).unwrap_or_else(|e| {
-            sess.fatal(&format!("Could not open {}: {}", file_name.display(), e))
+            sess.emit_fatal(errors::CouldNotOpen { file_name: file_name.as_path(), err: e })
         }));
 
         (output_file, file_name)