Rollup of 7 pull requests

Cargo.lock

@@ -269,6 +269,7 @@ version = "0.40.0"
 dependencies = [
  "atty",
  "bytesize",
+ "cargo-platform",
  "cargo-test-macro",
  "cargo-test-support",
  "clap",
@@ -278,7 +279,7 @@ dependencies = [
  "crypto-hash",
  "curl",
  "curl-sys",
- "env_logger",
+ "env_logger 0.7.0",
  "failure",
  "filetime",
  "flate2",
@@ -325,6 +326,13 @@ dependencies = [
  "winapi 0.3.6",
 ]
 
+[[package]]
+name = "cargo-platform"
+version = "0.1.0"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "cargo-test-macro"
 version = "0.1.0"
@@ -526,7 +534,7 @@ name = "compiletest"
 version = "0.0.0"
 dependencies = [
  "diff",
- "env_logger",
+ "env_logger 0.6.2",
  "getopts",
  "lazy_static 1.3.0",
  "libc",
@@ -938,6 +946,19 @@ dependencies = [
  "termcolor",
 ]
 
+[[package]]
+name = "env_logger"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39ecdb7dd54465526f0a56d666e3b2dd5f3a218665a030b6e4ad9e70fa95d8fa"
+dependencies = [
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "error-chain"
 version = "0.12.0"
@@ -1339,9 +1360,9 @@ checksum = "cd179ae861f0c2e53da70d892f5f3029f9594be0c41dc5269cd371691b1dc2f9"
 
 [[package]]
 name = "humantime"
-version = "1.2.0"
+version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3ca7e5f2e110db35f93b837c81797f3714500b81d517bf20c431b16d3ca4f114"
+checksum = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
 dependencies = [
  "quick-error",
 ]
@@ -1866,7 +1887,7 @@ dependencies = [
  "chrono",
  "clap",
  "elasticlunr-rs",
- "env_logger",
+ "env_logger 0.6.2",
  "error-chain",
  "handlebars",
  "itertools 0.8.0",
@@ -1891,7 +1912,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "77d1f0ba4d1e6b86fa18e8853d026d7d76a97eb7eb5eb052ed80901e43b7fc10"
 dependencies = [
- "env_logger",
+ "env_logger 0.6.2",
  "failure",
  "log",
  "mdbook",
@@ -2084,7 +2105,7 @@ dependencies = [
  "colored",
  "compiletest_rs",
  "directories",
- "env_logger",
+ "env_logger 0.6.2",
  "getrandom",
  "hex 0.3.2",
  "log",
@@ -2493,7 +2514,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "df8b3f4e0475def7d9c2e5de8e5a1306949849761e107b360d03e98eafaffd61"
 dependencies = [
  "chrono",
- "env_logger",
+ "env_logger 0.6.2",
  "log",
 ]
 
@@ -2620,7 +2641,7 @@ dependencies = [
  "bitflags",
  "clap",
  "derive_more",
- "env_logger",
+ "env_logger 0.6.2",
  "humantime",
  "lazy_static 1.3.0",
  "log",
@@ -2914,7 +2935,7 @@ dependencies = [
  "clippy_lints",
  "crossbeam-channel",
  "difference",
- "env_logger",
+ "env_logger 0.6.2",
  "failure",
  "futures",
  "heck",
@@ -2998,7 +3019,7 @@ name = "rls-rustc"
 version = "0.6.0"
 dependencies = [
  "clippy_lints",
- "env_logger",
+ "env_logger 0.6.2",
  "failure",
  "futures",
  "log",
@@ -3399,7 +3420,7 @@ dependencies = [
 name = "rustc_driver"
 version = "0.0.0"
 dependencies = [
- "env_logger",
+ "env_logger 0.6.2",
  "graphviz",
  "lazy_static 1.3.0",
  "log",
@@ -3781,7 +3802,7 @@ dependencies = [
  "derive-new",
  "diff",
  "dirs",
- "env_logger",
+ "env_logger 0.6.2",
  "failure",
  "getopts",
  "ignore",

src/librustc/hir/lowering.rs

@@ -2184,9 +2184,7 @@ impl<'a> LoweringContext<'a> {
             match decl.output {
                 FunctionRetTy::Ty(ref ty) => match in_band_ty_params {
                     Some((def_id, _)) if impl_trait_return_allow => {
-                        hir::Return(self.lower_ty(ty,
-                            ImplTraitContext::OpaqueTy(Some(def_id))
-                        ))
+                        hir::Return(self.lower_ty(ty, ImplTraitContext::OpaqueTy(Some(def_id))))
                     }
                     _ => {
                         hir::Return(self.lower_ty(ty, ImplTraitContext::disallowed()))

src/librustc/infer/opaque_types/mod.rs

@@ -988,7 +988,9 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
         value.fold_with(&mut BottomUpFolder {
             tcx,
             ty_op: |ty| {
-                if let ty::Opaque(def_id, substs) = ty.sty {
+                if ty.references_error() {
+                    return tcx.types.err;
+                } else if let ty::Opaque(def_id, substs) = ty.sty {
                     // Check that this is `impl Trait` type is
                     // declared by `parent_def_id` -- i.e., one whose
                     // value we are inferring.  At present, this is
@@ -1155,6 +1157,15 @@ impl<'a, 'tcx> Instantiator<'a, 'tcx> {
         );
         debug!("instantiate_opaque_types: ty_var={:?}", ty_var);
 
+        for predicate in &bounds.predicates {
+            if let ty::Predicate::Projection(projection) = &predicate {
+                if projection.skip_binder().ty.references_error() {
+                    // No point on adding these obligations since there's a type error involved.
+                    return ty_var;
+                }
+            }
+        }
+
         self.obligations.reserve(bounds.predicates.len());
         for predicate in bounds.predicates {
             // Change the predicate to refer to the type variable,