Add test for submodules in inner crate

Author: jyn514

src/test/rustdoc/intra-doc-crate/auxiliary/submodule-inner.rs

@@ -0,0 +1,11 @@
+#![crate_name = "a"]
+
+pub mod bar {
+   pub struct Bar;
+}
+
+pub mod foo {
+  use crate::bar;
+  /// link to [bar::Bar]
+  pub struct Foo;
+}

src/test/rustdoc/intra-doc-crate/auxiliary/submodule.rs renamed to src/test/rustdoc/intra-doc-crate/auxiliary/submodule-outer.rs

@@ -0,0 +1,6 @@
+// aux-build:submodule-inner.rs
+// build-aux-docs
+extern crate a;
+
+// @has 'submodule_inner/struct.Foo.html' '//a[@href="../a/bar/struct.Bar.html"]' 'Bar'
+pub use a::foo::Foo;

src/test/rustdoc/intra-doc-crate/submodule-inner.rs

@@ -1,4 +1,4 @@
-// aux-build:submodule.rs
+// aux-build:submodule-outer.rs
 // edition:2018
 extern crate bar as bar_;
 
@@ -9,6 +9,6 @@ pub mod bar {
 
 // NOTE: we re-exported both `Foo` and `Bar` here,
 // NOTE: so they are inlined and therefore we link to the current module.
-// @has 'submodule/trait.Foo.html' '//a[@href="../submodule/bar/trait.Bar.html"]' 'Bar'
-// @has 'submodule/trait.Foo.html' '//a[@href="../submodule/trait.Baz.html"]' 'Baz'
+// @has 'submodule_outer/trait.Foo.html' '//a[@href="../submodule_outer/bar/trait.Bar.html"]' 'Bar'
+// @has 'submodule_outer/trait.Foo.html' '//a[@href="../submodule_outer/trait.Baz.html"]' 'Baz'
 pub use ::bar_::{Foo, Baz};