From 92dcc53f94455e8933d76a8ba20642ceb069362d Mon Sep 17 00:00:00 2001
From: Florian Diebold <flodiebold@gmail.com>
Date: Wed, 7 Apr 2021 17:26:01 +0200
Subject: Remove Ty::substs{_mut}

Almost all uses actually only care about ADT substs, so it's better to
be explicit. The methods were a bad abstraction anyway since they
already didn't include the inner types of e.g. `TyKind::Ref` anymore.
---
 crates/hir/src/lib.rs             | 26 ++++++++++++++++++--------
 crates/hir/src/source_analyzer.rs |  6 +++---
 2 files changed, 21 insertions(+), 11 deletions(-)

(limited to 'crates/hir')

diff --git a/crates/hir/src/lib.rs b/crates/hir/src/lib.rs
index 86b36c565..13aaa408a 100644
--- a/crates/hir/src/lib.rs
+++ b/crates/hir/src/lib.rs
@@ -1972,9 +1972,9 @@ impl Type {
     pub fn type_parameters(&self) -> impl Iterator<Item = Type> + '_ {
         self.ty
             .strip_references()
-            .substs()
+            .as_adt()
             .into_iter()
-            .flat_map(|substs| substs.iter(&Interner))
+            .flat_map(|(_, substs)| substs.iter(&Interner))
             .filter_map(|arg| arg.ty(&Interner).cloned())
             .map(move |ty| self.derived(ty))
     }
@@ -2115,18 +2115,22 @@ impl Type {
         fn walk_type(db: &dyn HirDatabase, type_: &Type, cb: &mut impl FnMut(Type)) {
             let ty = type_.ty.strip_references();
             match ty.kind(&Interner) {
-                TyKind::Adt(..) => {
+                TyKind::Adt(_, substs) => {
                     cb(type_.derived(ty.clone()));
+                    walk_substs(db, type_, &substs, cb);
                 }
-                TyKind::AssociatedType(..) => {
+                TyKind::AssociatedType(_, substs) => {
                     if let Some(_) = ty.associated_type_parent_trait(db) {
                         cb(type_.derived(ty.clone()));
                     }
+                    walk_substs(db, type_, &substs, cb);
                 }
-                TyKind::OpaqueType(..) => {
+                TyKind::OpaqueType(_, subst) => {
                     if let Some(bounds) = ty.impl_trait_bounds(db) {
                         walk_bounds(db, &type_.derived(ty.clone()), &bounds, cb);
                     }
+
+                    walk_substs(db, type_, subst, cb);
                 }
                 TyKind::Alias(AliasTy::Opaque(opaque_ty)) => {
                     if let Some(bounds) = ty.impl_trait_bounds(db) {
@@ -2156,11 +2160,17 @@ impl Type {
                     walk_type(db, &type_.derived(ty.clone()), cb);
                 }
 
+                TyKind::FnDef(_, substs)
+                | TyKind::Tuple(_, substs)
+                | TyKind::Closure(.., substs) => {
+                    walk_substs(db, type_, &substs, cb);
+                }
+                TyKind::Function(hir_ty::FnPointer { substitution, .. }) => {
+                    walk_substs(db, type_, &substitution.0, cb);
+                }
+
                 _ => {}
             }
-            if let Some(substs) = ty.substs() {
-                walk_substs(db, type_, &substs, cb);
-            }
         }
 
         walk_type(db, self, &mut cb);
diff --git a/crates/hir/src/source_analyzer.rs b/crates/hir/src/source_analyzer.rs
index ce6f3c008..847d2537d 100644
--- a/crates/hir/src/source_analyzer.rs
+++ b/crates/hir/src/source_analyzer.rs
@@ -20,7 +20,7 @@ use hir_def::{
 use hir_expand::{hygiene::Hygiene, name::AsName, HirFileId, InFile};
 use hir_ty::{
     diagnostics::{record_literal_missing_fields, record_pattern_missing_fields},
-    InferenceResult, Interner, Substitution, TyLoweringContext,
+    InferenceResult, Interner, Substitution, TyExt, TyLoweringContext,
 };
 use syntax::{
     ast::{self, AstNode},
@@ -306,7 +306,7 @@ impl SourceAnalyzer {
         let infer = self.infer.as_ref()?;
 
         let expr_id = self.expr_id(db, &literal.clone().into())?;
-        let substs = infer.type_of_expr[expr_id].substs()?;
+        let substs = infer.type_of_expr[expr_id].as_adt()?.1;
 
         let (variant, missing_fields, _exhaustive) =
             record_literal_missing_fields(db, infer, expr_id, &body[expr_id])?;
@@ -324,7 +324,7 @@ impl SourceAnalyzer {
         let infer = self.infer.as_ref()?;
 
         let pat_id = self.pat_id(&pattern.clone().into())?;
-        let substs = infer.type_of_pat[pat_id].substs()?;
+        let substs = infer.type_of_pat[pat_id].as_adt()?.1;
 
         let (variant, missing_fields, _exhaustive) =
             record_pattern_missing_fields(db, infer, pat_id, &body[pat_id])?;
-- 
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