Move InferVarInfo out of rustc_middle.

It's only used in `rustc_hir_typeck`.

Author: nnethercote

compiler/rustc_hir_typeck/src/fallback.rs

@@ -18,6 +18,7 @@ use rustc_span::{DUMMY_SP, Span};
 use rustc_trait_selection::traits::{ObligationCause, ObligationCtxt};
 use tracing::debug;
 
+use crate::typeck_root_ctxt::InferVarInfo;
 use crate::{FnCtxt, errors};
 
 #[derive(Copy, Clone)]
@@ -345,7 +346,7 @@ impl<'tcx> FnCtxt<'_, 'tcx> {
                 .map(|(_, info)| *info)
                 .collect();
 
-            let found_infer_var_info = ty::InferVarInfo {
+            let found_infer_var_info = InferVarInfo {
                 self_in_trait: infer_var_infos.items().any(|info| info.self_in_trait),
                 output: infer_var_infos.items().any(|info| info.output),
             };

compiler/rustc_hir_typeck/src/typeck_root_ctxt.rs

@@ -17,6 +17,19 @@ use tracing::{debug, instrument};
 
 use super::callee::DeferredCallResolution;
 
+#[derive(Debug, Default, Copy, Clone)]
+pub(crate) struct InferVarInfo {
+    /// This is true if we identified that this Ty (`?T`) is found in a `?T: Foo`
+    /// obligation, where:
+    ///
+    ///  * `Foo` is not `Sized`
+    ///  * `(): Foo` may be satisfied
+    pub self_in_trait: bool,
+    /// This is true if we identified that this Ty (`?T`) is found in a `<_ as
+    /// _>::AssocType = ?T`
+    pub output: bool,
+}
+
 /// Data shared between a "typeck root" and its nested bodies,
 /// e.g. closures defined within the function. For example:
 /// ```ignore (illustrative)
@@ -71,7 +84,7 @@ pub(crate) struct TypeckRootCtxt<'tcx> {
     /// fallback. See the `fallback` module for details.
     pub(super) diverging_type_vars: RefCell<UnordSet<Ty<'tcx>>>,
 
-    pub(super) infer_var_info: RefCell<UnordMap<ty::TyVid, ty::InferVarInfo>>,
+    pub(super) infer_var_info: RefCell<UnordMap<ty::TyVid, InferVarInfo>>,
 }
 
 impl<'tcx> Deref for TypeckRootCtxt<'tcx> {

compiler/rustc_middle/src/ty/mod.rs

@@ -2232,19 +2232,6 @@ impl<'tcx> fmt::Debug for SymbolName<'tcx> {
     }
 }
 
-#[derive(Debug, Default, Copy, Clone)]
-pub struct InferVarInfo {
-    /// This is true if we identified that this Ty (`?T`) is found in a `?T: Foo`
-    /// obligation, where:
-    ///
-    ///  * `Foo` is not `Sized`
-    ///  * `(): Foo` may be satisfied
-    pub self_in_trait: bool,
-    /// This is true if we identified that this Ty (`?T`) is found in a `<_ as
-    /// _>::AssocType = ?T`
-    pub output: bool,
-}
-
 /// The constituent parts of a type level constant of kind ADT or array.
 #[derive(Copy, Clone, Debug, HashStable)]
 pub struct DestructuredConst<'tcx> {