Rollup merge of #133847 - nnethercote:rm-Z-show-span, r=compiler-errors

Remove `-Zshow-span`.

It's very old (added in #12087). It's strange, and it's not clear what its use cases are. It only works with the crate root file because it runs before expansion. I suspect it won't be missed.

r? `@estebank`

2 files changed, 0 insertions, 5 deletions

diff --git a/compiler/rustc_interface/src/passes.rs b/compiler/rustc_interface/src/passes.rs
index 06e27ed8060..d42915f4110 100644
--- a/compiler/rustc_interface/src/passes.rs
+++ b/compiler/rustc_interface/src/passes.rs
@@ -54,10 +54,6 @@ pub(crate) fn parse<'a>(sess: &'a Session) -> Result<ast::Crate> {
         })
         .map_err(|parse_error| parse_error.emit())?;
 
-    if let Some(ref s) = sess.opts.unstable_opts.show_span {
-        rustc_ast_passes::show_span::run(sess.dcx(), s, &krate);
-    }
-
     if sess.opts.unstable_opts.input_stats {
         input_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS", "ast-stats-1");
     }
diff --git a/compiler/rustc_interface/src/tests.rs b/compiler/rustc_interface/src/tests.rs
index 9384ed925c7..3c4d9c2e928 100644
--- a/compiler/rustc_interface/src/tests.rs
+++ b/compiler/rustc_interface/src/tests.rs
@@ -844,7 +844,6 @@ fn test_unstable_options_tracking_hash() {
     tracked!(sanitizer_recover, SanitizerSet::ADDRESS);
     tracked!(saturating_float_casts, Some(true));
     tracked!(share_generics, Some(true));
-    tracked!(show_span, Some(String::from("abc")));
     tracked!(simulate_remapped_rust_src_base, Some(PathBuf::from("/rustc/abc")));
     tracked!(small_data_threshold, Some(16));
     tracked!(split_lto_unit, Some(true));