From 666180c3242169fa40ec462617e96ebf831fc62d Mon Sep 17 00:00:00 2001
From: Wesley Wiser <wwiser@gmail.com>
Date: Sun, 4 Aug 2019 16:20:00 -0400
Subject: [PATCH] Move 'tcx lifetime on MirPass

---
 src/librustc_mir/transform/add_call_guards.rs            | 4 ++--
 src/librustc_mir/transform/add_moves_for_packed_drops.rs | 4 ++--
 src/librustc_mir/transform/add_retag.rs                  | 4 ++--
 src/librustc_mir/transform/cleanup_post_borrowck.rs      | 4 ++--
 src/librustc_mir/transform/const_prop.rs                 | 4 ++--
 src/librustc_mir/transform/copy_prop.rs                  | 4 ++--
 src/librustc_mir/transform/deaggregator.rs               | 4 ++--
 src/librustc_mir/transform/dump_mir.rs                   | 4 ++--
 src/librustc_mir/transform/elaborate_drops.rs            | 4 ++--
 src/librustc_mir/transform/erase_regions.rs              | 4 ++--
 src/librustc_mir/transform/generator.rs                  | 4 ++--
 src/librustc_mir/transform/inline.rs                     | 4 ++--
 src/librustc_mir/transform/instcombine.rs                | 4 ++--
 src/librustc_mir/transform/mod.rs                        | 8 ++++----
 src/librustc_mir/transform/no_landing_pads.rs            | 4 ++--
 src/librustc_mir/transform/qualify_consts.rs             | 4 ++--
 src/librustc_mir/transform/remove_noop_landing_pads.rs   | 4 ++--
 src/librustc_mir/transform/rustc_peek.rs                 | 4 ++--
 src/librustc_mir/transform/simplify.rs                   | 8 ++++----
 src/librustc_mir/transform/simplify_branches.rs          | 4 ++--
 src/librustc_mir/transform/uniform_array_move_out.rs     | 8 ++++----
 21 files changed, 48 insertions(+), 48 deletions(-)

diff --git a/src/librustc_mir/transform/add_call_guards.rs b/src/librustc_mir/transform/add_call_guards.rs
index c08c33bc6ff..15ecc6c3792 100644
--- a/src/librustc_mir/transform/add_call_guards.rs
+++ b/src/librustc_mir/transform/add_call_guards.rs
@@ -30,8 +30,8 @@ pub use self::AddCallGuards::*;
  *
  */
 
-impl MirPass for AddCallGuards {
-    fn run_pass<'tcx>(&self, _tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for AddCallGuards {
+    fn run_pass(&self, _tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         self.add_call_guards(body);
     }
 }
diff --git a/src/librustc_mir/transform/add_moves_for_packed_drops.rs b/src/librustc_mir/transform/add_moves_for_packed_drops.rs
index 426e16698d7..052631ddff3 100644
--- a/src/librustc_mir/transform/add_moves_for_packed_drops.rs
+++ b/src/librustc_mir/transform/add_moves_for_packed_drops.rs
@@ -39,8 +39,8 @@ use crate::util;
 
 pub struct AddMovesForPackedDrops;
 
-impl MirPass for AddMovesForPackedDrops {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for AddMovesForPackedDrops {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         debug!("add_moves_for_packed_drops({:?} @ {:?})", src, body.span);
         add_moves_for_packed_drops(tcx, body, src.def_id());
     }
diff --git a/src/librustc_mir/transform/add_retag.rs b/src/librustc_mir/transform/add_retag.rs
index 524a19e3434..0fd75cd57b2 100644
--- a/src/librustc_mir/transform/add_retag.rs
+++ b/src/librustc_mir/transform/add_retag.rs
@@ -65,8 +65,8 @@ fn may_be_reference<'tcx>(ty: Ty<'tcx>) -> bool {
     }
 }
 
-impl MirPass for AddRetag {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for AddRetag {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         if !tcx.sess.opts.debugging_opts.mir_emit_retag {
             return;
         }
diff --git a/src/librustc_mir/transform/cleanup_post_borrowck.rs b/src/librustc_mir/transform/cleanup_post_borrowck.rs
index 6ee14160bbd..ede1cb62f94 100644
--- a/src/librustc_mir/transform/cleanup_post_borrowck.rs
+++ b/src/librustc_mir/transform/cleanup_post_borrowck.rs
@@ -26,8 +26,8 @@ pub struct CleanupNonCodegenStatements;
 
 pub struct DeleteNonCodegenStatements;
 
-impl MirPass for CleanupNonCodegenStatements {
-    fn run_pass<'tcx>(&self, _tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for CleanupNonCodegenStatements {
+    fn run_pass(&self, _tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let mut delete = DeleteNonCodegenStatements;
         delete.visit_body(body);
     }
diff --git a/src/librustc_mir/transform/const_prop.rs b/src/librustc_mir/transform/const_prop.rs
index 98d8ca58ee1..ac442a496e5 100644
--- a/src/librustc_mir/transform/const_prop.rs
+++ b/src/librustc_mir/transform/const_prop.rs
@@ -33,8 +33,8 @@ use crate::transform::{MirPass, MirSource};
 
 pub struct ConstProp;
 
-impl MirPass for ConstProp {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for ConstProp {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
         // will be evaluated by miri and produce its errors there
         if source.promoted.is_some() {
             return;
diff --git a/src/librustc_mir/transform/copy_prop.rs b/src/librustc_mir/transform/copy_prop.rs
index 7c9eeb5a577..f3a523a8134 100644
--- a/src/librustc_mir/transform/copy_prop.rs
+++ b/src/librustc_mir/transform/copy_prop.rs
@@ -29,8 +29,8 @@ use crate::util::def_use::DefUseAnalysis;
 
 pub struct CopyPropagation;
 
-impl MirPass for CopyPropagation {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for CopyPropagation {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
         // We only run when the MIR optimization level is > 1.
         // This avoids a slow pass, and messing up debug info.
         if tcx.sess.opts.debugging_opts.mir_opt_level <= 1 {
diff --git a/src/librustc_mir/transform/deaggregator.rs b/src/librustc_mir/transform/deaggregator.rs
index 1b42a0dffb8..1fc7ce09aa6 100644
--- a/src/librustc_mir/transform/deaggregator.rs
+++ b/src/librustc_mir/transform/deaggregator.rs
@@ -5,8 +5,8 @@ use crate::util::expand_aggregate;
 
 pub struct Deaggregator;
 
-impl MirPass for Deaggregator {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for Deaggregator {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let (basic_blocks, local_decls) = body.basic_blocks_and_local_decls_mut();
         let local_decls = &*local_decls;
         for bb in basic_blocks {
diff --git a/src/librustc_mir/transform/dump_mir.rs b/src/librustc_mir/transform/dump_mir.rs
index a6fb555f20b..ed0eff943a1 100644
--- a/src/librustc_mir/transform/dump_mir.rs
+++ b/src/librustc_mir/transform/dump_mir.rs
@@ -13,12 +13,12 @@ use crate::util as mir_util;
 
 pub struct Marker(pub &'static str);
 
-impl MirPass for Marker {
+impl<'tcx> MirPass<'tcx> for Marker {
     fn name(&self) -> Cow<'_, str> {
         Cow::Borrowed(self.0)
     }
 
-    fn run_pass<'tcx>(&self, _tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, _body: &mut Body<'tcx>) {
+    fn run_pass(&self, _tcx: TyCtxt<'tcx>, _source: MirSource<'tcx>, _body: &mut Body<'tcx>) {
     }
 }
 
diff --git a/src/librustc_mir/transform/elaborate_drops.rs b/src/librustc_mir/transform/elaborate_drops.rs
index 4480d1e0a05..7a5c00c8596 100644
--- a/src/librustc_mir/transform/elaborate_drops.rs
+++ b/src/librustc_mir/transform/elaborate_drops.rs
@@ -20,8 +20,8 @@ use syntax_pos::Span;
 
 pub struct ElaborateDrops;
 
-impl MirPass for ElaborateDrops {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for ElaborateDrops {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         debug!("elaborate_drops({:?} @ {:?})", src, body.span);
 
         let def_id = src.def_id();
diff --git a/src/librustc_mir/transform/erase_regions.rs b/src/librustc_mir/transform/erase_regions.rs
index 5a29ea21a7a..21ca339eb96 100644
--- a/src/librustc_mir/transform/erase_regions.rs
+++ b/src/librustc_mir/transform/erase_regions.rs
@@ -49,8 +49,8 @@ impl MutVisitor<'tcx> for EraseRegionsVisitor<'tcx> {
 
 pub struct EraseRegions;
 
-impl MirPass for EraseRegions {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for EraseRegions {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
         EraseRegionsVisitor::new(tcx).visit_body(body);
     }
 }
diff --git a/src/librustc_mir/transform/generator.rs b/src/librustc_mir/transform/generator.rs
index f6941880240..d87331195dd 100644
--- a/src/librustc_mir/transform/generator.rs
+++ b/src/librustc_mir/transform/generator.rs
@@ -1115,8 +1115,8 @@ where
     }).collect()
 }
 
-impl MirPass for StateTransform {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for StateTransform {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let yield_ty = if let Some(yield_ty) = body.yield_ty {
             yield_ty
         } else {
diff --git a/src/librustc_mir/transform/inline.rs b/src/librustc_mir/transform/inline.rs
index bc7bd39be48..57aac2b0eac 100644
--- a/src/librustc_mir/transform/inline.rs
+++ b/src/librustc_mir/transform/inline.rs
@@ -37,8 +37,8 @@ struct CallSite<'tcx> {
     location: SourceInfo,
 }
 
-impl MirPass for Inline {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for Inline {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>) {
         if tcx.sess.opts.debugging_opts.mir_opt_level >= 2 {
             Inliner { tcx, source }.run_pass(body);
         }
diff --git a/src/librustc_mir/transform/instcombine.rs b/src/librustc_mir/transform/instcombine.rs
index b2d063a1f4e..abe41606e80 100644
--- a/src/librustc_mir/transform/instcombine.rs
+++ b/src/librustc_mir/transform/instcombine.rs
@@ -11,8 +11,8 @@ use crate::transform::{MirPass, MirSource};
 
 pub struct InstCombine;
 
-impl MirPass for InstCombine {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for InstCombine {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
         // We only run when optimizing MIR (at any level).
         if tcx.sess.opts.debugging_opts.mir_opt_level == 0 {
             return
diff --git a/src/librustc_mir/transform/mod.rs b/src/librustc_mir/transform/mod.rs
index 61d0b1f3485..255635b9333 100644
--- a/src/librustc_mir/transform/mod.rs
+++ b/src/librustc_mir/transform/mod.rs
@@ -137,12 +137,12 @@ pub fn default_name<T: ?Sized>() -> Cow<'static, str> {
 /// A streamlined trait that you can implement to create a pass; the
 /// pass will be named after the type, and it will consist of a main
 /// loop that goes over each available MIR and applies `run_pass`.
-pub trait MirPass {
+pub trait MirPass<'tcx> {
     fn name(&self) -> Cow<'_, str> {
         default_name::<Self>()
     }
 
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>);
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, source: MirSource<'tcx>, body: &mut Body<'tcx>);
 }
 
 pub fn run_passes(
@@ -150,7 +150,7 @@ pub fn run_passes(
     body: &mut Body<'tcx>,
     instance: InstanceDef<'tcx>,
     mir_phase: MirPhase,
-    passes: &[&dyn MirPass],
+    passes: &[&dyn MirPass<'tcx>],
 ) {
     let phase_index = mir_phase.phase_index();
 
@@ -164,7 +164,7 @@ pub fn run_passes(
             promoted,
         };
         let mut index = 0;
-        let mut run_pass = |pass: &dyn MirPass| {
+        let mut run_pass = |pass: &dyn MirPass<'tcx>| {
             let run_hooks = |body: &_, index, is_after| {
                 dump_mir::on_mir_pass(tcx, &format_args!("{:03}-{:03}", phase_index, index),
                                       &pass.name(), source, body, is_after);
diff --git a/src/librustc_mir/transform/no_landing_pads.rs b/src/librustc_mir/transform/no_landing_pads.rs
index 841db80fc7d..762bb5d4483 100644
--- a/src/librustc_mir/transform/no_landing_pads.rs
+++ b/src/librustc_mir/transform/no_landing_pads.rs
@@ -8,8 +8,8 @@ use crate::transform::{MirPass, MirSource};
 
 pub struct NoLandingPads;
 
-impl MirPass for NoLandingPads {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for NoLandingPads {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
         no_landing_pads(tcx, body)
     }
 }
diff --git a/src/librustc_mir/transform/qualify_consts.rs b/src/librustc_mir/transform/qualify_consts.rs
index 649cccc36c3..1fe45a2c424 100644
--- a/src/librustc_mir/transform/qualify_consts.rs
+++ b/src/librustc_mir/transform/qualify_consts.rs
@@ -1572,8 +1572,8 @@ fn mir_const_qualif(tcx: TyCtxt<'_>, def_id: DefId) -> (u8, &BitSet<Local>) {
 
 pub struct QualifyAndPromoteConstants;
 
-impl MirPass for QualifyAndPromoteConstants {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for QualifyAndPromoteConstants {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         // There's not really any point in promoting errorful MIR.
         if body.return_ty().references_error() {
             tcx.sess.delay_span_bug(body.span, "QualifyAndPromoteConstants: MIR had errors");
diff --git a/src/librustc_mir/transform/remove_noop_landing_pads.rs b/src/librustc_mir/transform/remove_noop_landing_pads.rs
index adba9097d12..73089a2106f 100644
--- a/src/librustc_mir/transform/remove_noop_landing_pads.rs
+++ b/src/librustc_mir/transform/remove_noop_landing_pads.rs
@@ -18,8 +18,8 @@ pub fn remove_noop_landing_pads<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>)
     RemoveNoopLandingPads.remove_nop_landing_pads(body)
 }
 
-impl MirPass for RemoveNoopLandingPads {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for RemoveNoopLandingPads {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         remove_noop_landing_pads(tcx, body);
     }
 }
diff --git a/src/librustc_mir/transform/rustc_peek.rs b/src/librustc_mir/transform/rustc_peek.rs
index 598de3a77e6..1d3bf247387 100644
--- a/src/librustc_mir/transform/rustc_peek.rs
+++ b/src/librustc_mir/transform/rustc_peek.rs
@@ -23,8 +23,8 @@ use crate::dataflow::has_rustc_mir_with;
 
 pub struct SanityCheck;
 
-impl MirPass for SanityCheck {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for SanityCheck {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let def_id = src.def_id();
         if !tcx.has_attr(def_id, sym::rustc_mir) {
             debug!("skipping rustc_peek::SanityCheck on {}", tcx.def_path_str(def_id));
diff --git a/src/librustc_mir/transform/simplify.rs b/src/librustc_mir/transform/simplify.rs
index 2eed9d453f2..d4599ee08aa 100644
--- a/src/librustc_mir/transform/simplify.rs
+++ b/src/librustc_mir/transform/simplify.rs
@@ -52,12 +52,12 @@ pub fn simplify_cfg(body: &mut Body<'_>) {
     body.basic_blocks_mut().raw.shrink_to_fit();
 }
 
-impl MirPass for SimplifyCfg {
+impl<'tcx> MirPass<'tcx> for SimplifyCfg {
     fn name(&self) -> Cow<'_, str> {
         Cow::Borrowed(&self.label)
     }
 
-    fn run_pass<'tcx>(&self, _tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+    fn run_pass(&self, _tcx: TyCtxt<'tcx>, _src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         debug!("SimplifyCfg({:?}) - simplifying {:?}", self.label, body);
         simplify_cfg(body);
     }
@@ -292,8 +292,8 @@ pub fn remove_dead_blocks(body: &mut Body<'_>) {
 
 pub struct SimplifyLocals;
 
-impl MirPass for SimplifyLocals {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for SimplifyLocals {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, _: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let mut marker = DeclMarker { locals: BitSet::new_empty(body.local_decls.len()) };
         marker.visit_body(body);
         // Return pointer and arguments are always live
diff --git a/src/librustc_mir/transform/simplify_branches.rs b/src/librustc_mir/transform/simplify_branches.rs
index 9ffa3db4c2e..0a509666d34 100644
--- a/src/librustc_mir/transform/simplify_branches.rs
+++ b/src/librustc_mir/transform/simplify_branches.rs
@@ -14,12 +14,12 @@ impl SimplifyBranches {
     }
 }
 
-impl MirPass for SimplifyBranches {
+impl<'tcx> MirPass<'tcx> for SimplifyBranches {
     fn name(&self) -> Cow<'_, str> {
         Cow::Borrowed(&self.label)
     }
 
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let param_env = tcx.param_env(src.def_id());
         for block in body.basic_blocks_mut() {
             let terminator = block.terminator_mut();
diff --git a/src/librustc_mir/transform/uniform_array_move_out.rs b/src/librustc_mir/transform/uniform_array_move_out.rs
index 60489e7fa36..8199a252e78 100644
--- a/src/librustc_mir/transform/uniform_array_move_out.rs
+++ b/src/librustc_mir/transform/uniform_array_move_out.rs
@@ -36,8 +36,8 @@ use crate::util::patch::MirPatch;
 
 pub struct UniformArrayMoveOut;
 
-impl MirPass for UniformArrayMoveOut {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for UniformArrayMoveOut {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let mut patch = MirPatch::new(body);
         let param_env = tcx.param_env(src.def_id());
         {
@@ -184,8 +184,8 @@ impl<'a, 'tcx> UniformArrayMoveOutVisitor<'a, 'tcx> {
 
 pub struct RestoreSubsliceArrayMoveOut;
 
-impl MirPass for RestoreSubsliceArrayMoveOut {
-    fn run_pass<'tcx>(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
+impl<'tcx> MirPass<'tcx> for RestoreSubsliceArrayMoveOut {
+    fn run_pass(&self, tcx: TyCtxt<'tcx>, src: MirSource<'tcx>, body: &mut Body<'tcx>) {
         let mut patch = MirPatch::new(body);
         let param_env = tcx.param_env(src.def_id());
         {