Auto merge of #99054 - Dylan-DPC:rollup-0zuhhds, r=Dylan-DPC

Rollup of 4 pull requests

Successful merges:

 - #98533 (Add a `-Zdump-drop-tracking-cfg` debugging flag)
 - #98654 (An optimization for `pest-2.1.3`)
 - #98657 (Migrate some diagnostics from `rustc_const_eval` to `SessionDiagnostic`)
 - #98794 (Highlight conflicting param-env candidates)

Failed merges:

 - #98957 ( don't allow ZST in ScalarInt )

r? `@ghost`
`@rustbot` modify labels: rollup

2 files changed, 12 insertions, 1 deletions

diff --git a/compiler/rustc_session/src/options.rs b/compiler/rustc_session/src/options.rs
index b0c74ffb6dc..b617eb02eb6 100644
--- a/compiler/rustc_session/src/options.rs
+++ b/compiler/rustc_session/src/options.rs
@@ -1246,6 +1246,8 @@ options! {
     dump_dep_graph: bool = (false, parse_bool, [UNTRACKED],
         "dump the dependency graph to $RUST_DEP_GRAPH (default: /tmp/dep_graph.gv) \
         (default: no)"),
+    dump_drop_tracking_cfg: Option<String> = (None, parse_opt_string, [UNTRACKED],
+        "dump drop-tracking control-flow graph as a `.dot` file (default: no)"),
     dump_mir: Option<String> = (None, parse_opt_string, [UNTRACKED],
         "dump MIR state to file.
         `val` is used to select which passes and functions to dump. For example:
diff --git a/compiler/rustc_session/src/session.rs b/compiler/rustc_session/src/session.rs
index 52b9ee94718..1eee0c3163d 100644
--- a/compiler/rustc_session/src/session.rs
+++ b/compiler/rustc_session/src/session.rs
@@ -2,7 +2,7 @@ use crate::cgu_reuse_tracker::CguReuseTracker;
 use crate::code_stats::CodeStats;
 pub use crate::code_stats::{DataTypeKind, FieldInfo, SizeKind, VariantInfo};
 use crate::config::{self, CrateType, OutputType, SwitchWithOptPath};
-use crate::parse::ParseSess;
+use crate::parse::{add_feature_diagnostics, ParseSess};
 use crate::search_paths::{PathKind, SearchPath};
 use crate::{filesearch, lint};
 
@@ -458,6 +458,15 @@ impl Session {
     ) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
         self.parse_sess.create_err(err)
     }
+    pub fn create_feature_err<'a>(
+        &'a self,
+        err: impl SessionDiagnostic<'a>,
+        feature: Symbol,
+    ) -> DiagnosticBuilder<'a, ErrorGuaranteed> {
+        let mut err = self.parse_sess.create_err(err);
+        add_feature_diagnostics(&mut err, &self.parse_sess, feature);
+        err
+    }
     pub fn emit_err<'a>(&'a self, err: impl SessionDiagnostic<'a>) -> ErrorGuaranteed {
         self.parse_sess.emit_err(err)
     }