Rollup merge of #103865 - compiler-errors:fallback-has-occurred-tracking, r=eholk

Move `fallback_has_occurred` state tracking to `FnCtxt`

Removes a ton of callsites that defaulted to `false`

2 files changed, 3 insertions, 2 deletions

diff --git a/compiler/rustc_infer/src/infer/error_reporting/mod.rs b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
index e4a76fbd451..3dbc9b9f3f9 100644
--- a/compiler/rustc_infer/src/infer/error_reporting/mod.rs
+++ b/compiler/rustc_infer/src/infer/error_reporting/mod.rs
@@ -91,6 +91,7 @@ pub mod nice_region_error;
 pub struct TypeErrCtxt<'a, 'tcx> {
     pub infcx: &'a InferCtxt<'tcx>,
     pub typeck_results: Option<std::cell::Ref<'a, ty::TypeckResults<'tcx>>>,
+    pub fallback_has_occurred: bool,
 }
 
 impl TypeErrCtxt<'_, '_> {
diff --git a/compiler/rustc_infer/src/infer/mod.rs b/compiler/rustc_infer/src/infer/mod.rs
index c2eecd9e87a..d5be9983ea7 100644
--- a/compiler/rustc_infer/src/infer/mod.rs
+++ b/compiler/rustc_infer/src/infer/mod.rs
@@ -677,9 +677,9 @@ pub struct CombinedSnapshot<'tcx> {
 
 impl<'tcx> InferCtxt<'tcx> {
     /// Creates a `TypeErrCtxt` for emitting various inference errors.
-    /// During typeck, use `FnCtxt::infer_err` instead.
+    /// During typeck, use `FnCtxt::err_ctxt` instead.
     pub fn err_ctxt(&self) -> TypeErrCtxt<'_, 'tcx> {
-        TypeErrCtxt { infcx: self, typeck_results: None }
+        TypeErrCtxt { infcx: self, typeck_results: None, fallback_has_occurred: false }
     }
 
     /// calls `tcx.try_unify_abstract_consts` after