Rollup merge of #136445 - bjorn3:diag_ctxt_cleanup, r=oli-obk

Couple of cleanups to DiagCtxt and EarlyDiagCtxt

Author: matthiaskrgr

src/bin/miri.rs

@@ -379,10 +379,8 @@ fn run_compiler_and_exit(
     callbacks: &mut (dyn rustc_driver::Callbacks + Send),
 ) -> ! {
     // Invoke compiler, and handle return code.
-    let exit_code = rustc_driver::catch_with_exit_code(move || {
-        rustc_driver::run_compiler(args, callbacks);
-        Ok(())
-    });
+    let exit_code =
+        rustc_driver::catch_with_exit_code(move || rustc_driver::run_compiler(args, callbacks));
     std::process::exit(exit_code)
 }
 
@@ -461,7 +459,7 @@ fn main() {
     // (`install_ice_hook` might change `RUST_BACKTRACE`.)
     let env_snapshot = env::vars_os().collect::<Vec<_>>();
 
-    let args = rustc_driver::args::raw_args(&early_dcx)
+    let args = rustc_driver::catch_fatal_errors(|| rustc_driver::args::raw_args(&early_dcx))
         .unwrap_or_else(|_| std::process::exit(rustc_driver::EXIT_FAILURE));
 
     // Install the ctrlc handler that sets `rustc_const_eval::CTRL_C_RECEIVED`, even if