From e503135eb7aa91bd28256b7f91b62ee265b47fdf Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Fri, 16 Sep 2016 22:30:33 +0800
Subject: Notes - `box` operator quirks

---
 Notes/BoxOperator.md | 36 ++++++++++++++++++++++++++++++++++++
 Notes/todo.txt       |  7 +++----
 2 files changed, 39 insertions(+), 4 deletions(-)
 create mode 100644 Notes/BoxOperator.md

(limited to 'Notes')

diff --git a/Notes/BoxOperator.md b/Notes/BoxOperator.md
new file mode 100644
index 00000000..33e30268
--- /dev/null
+++ b/Notes/BoxOperator.md
@@ -0,0 +1,36 @@
+% `box` and `in` operators
+
+See: https://github.com/rust-lang/rfcs/pull/1426#r48383364
+
+Structures
+=========
+
+AST
+---
+
+UniOp for `box` and BinOp for `in` and `<-`
+
+
+HIR
+---
+
+```c++
+struct ExprNode_Emplace
+{
+    enum class Type {
+        Placer,
+        Boxer,
+    };
+    
+    Type    m_type;
+    ExprNodeP   m_place;
+    ExprNodeP   m_value;
+}
+```
+
+
+Type Inferrence
+===============
+
+The `_Emplace` node type has a revisit to obtain the expected result type.
+
diff --git a/Notes/todo.txt b/Notes/todo.txt
index b1518ef4..161c34eb 100644
--- a/Notes/todo.txt
+++ b/Notes/todo.txt
@@ -1,8 +1,7 @@
 TODO:
-- Fix method selection such that calling `let _: Foo = bar.into();` works
- - A `From<Bar>` impl for `Foo` isn't found, becuase the code that searches for the `Into` impl doesn't know that the param is `Foo`
- - Could have an edge case where a trait is selected if it's the only possibility (there's no other source of that method name)
- - Correct solution would be to hand parameters to the `find_method` function.
+- Replace `box` desugaring with passthrough to HIR which will replace with operator call after typeck
+ - See https://github.com/rust-lang/rfcs/pull/1426#r48383364
+ - May require a design/notes doc covering the inferrence behavior.
 - Audit TODOs in codebase
 - Method and type monomorphisation
 - Test compile against a no_std program
-- 
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