From 07a704e31cf74deb28a15859b5adfe65ed709bf4 Mon Sep 17 00:00:00 2001
From: Jonas Schievink <jonasschievink@gmail.com>
Date: Sat, 12 Sep 2020 21:18:57 +0200
Subject: Implement box pattern inference

---
 crates/hir_def/src/body/lower.rs | 6 +++++-
 crates/hir_def/src/expr.rs       | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

(limited to 'crates/hir_def')

diff --git a/crates/hir_def/src/body/lower.rs b/crates/hir_def/src/body/lower.rs
index 30ac12a12..9ea3d5291 100644
--- a/crates/hir_def/src/body/lower.rs
+++ b/crates/hir_def/src/body/lower.rs
@@ -835,8 +835,12 @@ impl ExprCollector<'_> {
 
                 Pat::Missing
             }
+            ast::Pat::BoxPat(boxpat) => {
+                let inner = self.collect_pat_opt(boxpat.pat());
+                Pat::Box { inner }
+            }
             // FIXME: implement
-            ast::Pat::BoxPat(_) | ast::Pat::RangePat(_) | ast::Pat::MacroPat(_) => Pat::Missing,
+            ast::Pat::RangePat(_) | ast::Pat::MacroPat(_) => Pat::Missing,
         };
         let ptr = AstPtr::new(&pat);
         self.alloc_pat(pattern, Either::Left(ptr))
diff --git a/crates/hir_def/src/expr.rs b/crates/hir_def/src/expr.rs
index c94b3a36f..dc975d42f 100644
--- a/crates/hir_def/src/expr.rs
+++ b/crates/hir_def/src/expr.rs
@@ -395,6 +395,7 @@ pub enum Pat {
     Bind { mode: BindingAnnotation, name: Name, subpat: Option<PatId> },
     TupleStruct { path: Option<Path>, args: Vec<PatId>, ellipsis: Option<usize> },
     Ref { pat: PatId, mutability: Mutability },
+    Box { inner: PatId },
 }
 
 impl Pat {
@@ -415,6 +416,7 @@ impl Pat {
             Pat::Record { args, .. } => {
                 args.iter().map(|f| f.pat).for_each(f);
             }
+            Pat::Box { inner } => f(*inner),
         }
     }
 }
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