Rollup merge of #33044 - petrochenkov:prefix, r=eddyb

syntax: Parse import prefixes as paths

Fixes https://github.com/rust-lang/rust/issues/10415

r? @eddyb
(This partially intersects with https://github.com/rust-lang/rust/pull/33041)

src/test/compile-fail/import-prefix-macro-1.rs

@@ -0,0 +1,26 @@
+// 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.
+
+mod a {
+    pub mod b {
+        pub mod c {
+            pub struct S;
+            pub struct Z;
+        }
+    }
+}
+
+macro_rules! import {
+    ($p: path) => (use $p {S, Z}); //~ERROR expected one of `::`, `;`, or `as`, found `{`
+}
+
+import! { a::b::c }
+
+fn main() {}

src/test/compile-fail/import-prefix-macro-2.rs

@@ -0,0 +1,26 @@
+// 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.
+
+mod a {
+    pub mod b {
+        pub mod c {
+            pub struct S;
+            pub struct Z;
+        }
+    }
+}
+
+macro_rules! import {
+    ($p: path) => (use ::$p {S, Z}); //~ERROR  expected identifier, found `a::b::c`
+}
+
+import! { a::b::c }
+
+fn main() {}

src/test/compile-fail/import-ty-params.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.
+
+mod a {
+    pub mod b {
+        pub mod c {
+            pub struct S<T>(T);
+        }
+    }
+}
+
+macro_rules! import {
+    ($p: path) => (use $p;);
+}
+
+import! { a::b::c::S<u8> } //~ERROR type or lifetime parameter is found in import path
+
+fn main() {}

src/test/compile-fail/self_type_keyword-2.rs

@@ -0,0 +1,13 @@
+// Copyright 2015 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.
+
+use self::Self as Foo; //~ ERROR unresolved import `self::Self`
+
+pub fn main() {}

src/test/compile-fail/self_type_keyword.rs

@@ -39,9 +39,6 @@ pub fn main() {
     }
 }
 
-use self::Self as Foo;
-//~^ ERROR expected identifier, found keyword `Self`
-
 use std::option::Option as Self;
 //~^ ERROR expected identifier, found keyword `Self`
 

src/test/parse-fail/use-ends-with-mod-sep.rs

@@ -10,4 +10,4 @@
 
 // compile-flags: -Z parse-only
 
-use std::any::; //~ ERROR expected identifier or `{` or `*`, found `;`
+use std::any::; //~ ERROR expected identifier, found `;`

src/test/run-pass/import-prefix-macro.rs

@@ -0,0 +1,35 @@
+// 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.
+
+mod a {
+    pub mod b {
+        pub mod c {
+            pub struct S;
+            pub struct Z;
+        }
+        pub struct W;
+    }
+}
+
+macro_rules! import {
+    (1 $p: path) => (use $p;);
+    (2 $p: path) => (use $p::{Z};);
+    (3 $p: path) => (use $p::*;);
+}
+
+import! { 1 a::b::c::S }
+import! { 2 a::b::c }
+import! { 3 a::b }
+
+fn main() {
+    let s = S;
+    let z = Z;
+    let w = W;
+}