Auto merge of #36406 - arielb1:constant-padding, r=eddyb

use `adt::trans_const` when translating constant closures and tuples

The previous way dropped padding on the floor.

Fixes #36401

r? @eddyb

src/test/run-pass/issue-36401.rs

@@ -0,0 +1,25 @@
+// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+#[derive(Debug)]
+pub enum Event {
+    Key(u8),
+    Resize,
+    Unknown(u16),
+}
+
+static XTERM_SINGLE_BYTES : [(u8, Event); 1] = [(1,  Event::Resize)];
+
+fn main() {
+    match XTERM_SINGLE_BYTES[0] {
+        (1, Event::Resize) => {},
+        ref bad => panic!("unexpected {:?}", bad)
+    }
+}