resolve type and region variables in "NLL dropck"

nikomatsakis · nikomatsakis · commit 00ce7eed7d03 · 2018-01-10T10:15:08.000-05:00
Fixes #47022.
diff --git a/src/librustc_mir/borrow_check/nll/type_check/liveness.rs b/src/librustc_mir/borrow_check/nll/type_check/liveness.rs
@@ -214,6 +214,7 @@ impl<'gen, 'typeck, 'flow, 'gcx, 'tcx> TypeLivenessGenerator<'gen, 'typeck, 'flo
             // associated types here and possibly recursively process.
             for ty in dtorck_types {
                 let ty = self.cx.normalize(&ty, location);
+                let ty = self.cx.infcx.resolve_type_and_region_vars_if_possible(&ty);
                 match ty.sty {
                     ty::TyParam(..) | ty::TyProjection(..) | ty::TyAnon(..) => {
                         let cause = Cause::DropVar(dropped_local, location);
diff --git a/src/test/ui/nll/issue-47022.rs b/src/test/ui/nll/issue-47022.rs
@@ -0,0 +1,47 @@
+// Copyright 2017 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.
+
+// must-compile-successfully
+
+#![allow(warnings)]
+#![feature(nll)]
+
+struct LoadedObject {
+    bodies: Vec<Body>,
+    color: Color,
+}
+
+struct Body;
+
+#[derive(Clone)]
+struct Color;
+
+struct Graphic {
+    color: Color,
+}
+
+fn convert(objects: Vec<LoadedObject>) -> (Vec<Body>, Vec<Graphic>) {
+    objects
+        .into_iter()
+        .flat_map(|LoadedObject { bodies, color, .. }| {
+            bodies.into_iter().map(move |body| {
+                (
+                    body,
+                    Graphic {
+                        color: color.clone(),
+                    },
+                )
+            })
+        })
+        .unzip()
+}
+
+fn main() {}
+
