Overhaul `Diagnostic` args.

First, introduce a typedef `DiagnosticArgMap`.

Second, make the `args` field public, and remove the `args` getter and
`replace_args` setter. These were necessary previously because the getter
had a `#[allow(rustc::potential_query_instability)]` attribute, but that
was removed in #120931 when the args were changed from `FxHashMap` to
`FxIndexMap`. (All the other `Diagnostic` fields are public.)

1 files changed, 1 insertions, 1 deletions

diff --git a/src/librustdoc/passes/lint/check_code_block_syntax.rs b/src/librustdoc/passes/lint/check_code_block_syntax.rs
index 6649894f9c2..f3537873dc2 100644
--- a/src/librustdoc/passes/lint/check_code_block_syntax.rs
+++ b/src/librustdoc/passes/lint/check_code_block_syntax.rs
@@ -159,7 +159,7 @@ impl Emitter for BufferEmitter {
     fn emit_diagnostic(&mut self, diag: Diagnostic) {
         let mut buffer = self.buffer.borrow_mut();
 
-        let fluent_args = to_fluent_args(diag.args());
+        let fluent_args = to_fluent_args(diag.args.iter());
         let translated_main_message = self
             .translate_message(&diag.messages[0].0, &fluent_args)
             .unwrap_or_else(|e| panic!("{e}"));