Add UI test for ty alias mangling

Author: GuillaumeGomez

src/test/ui/symbol-names/ty-alias.legacy.stderr

@@ -0,0 +1,38 @@
+error: symbol-name(_ZN8ty_alias5Trait6method17ha7d0f40d408a4a48E)
+  --> $DIR/ty-alias.rs:11:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(ty_alias::Trait::method::ha7d0f40d408a4a48)
+  --> $DIR/ty-alias.rs:11:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(ty_alias::Trait::method)
+  --> $DIR/ty-alias.rs:11:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_ZN118_$LT$ty_alias..Foo$LT$T$GT$$u20$as$u20$ty_alias..Trait$LT$$LT$T$u20$as$u20$core..ops..deref..Deref$GT$..Target$GT$$GT$6method17he3e1099a8910c704E)
+  --> $DIR/ty-alias.rs:23:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<ty_alias::Foo<T> as ty_alias::Trait<<T as core::ops::deref::Deref>::Target>>::method::he3e1099a8910c704)
+  --> $DIR/ty-alias.rs:23:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<ty_alias::Foo<T> as ty_alias::Trait<<T as core::ops::deref::Deref>::Target>>::method)
+  --> $DIR/ty-alias.rs:23:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 6 previous errors
+

src/test/ui/symbol-names/ty-alias.rs

@@ -0,0 +1,34 @@
+// build-fail
+// ignore-tidy-linelength
+// revisions: legacy v0
+//[legacy]compile-flags: -Z unstable-options -C symbol-mangling-version=legacy
+    //[v0]compile-flags: -C symbol-mangling-version=v0
+
+#![feature(rustc_attrs)]
+#![crate_type = "lib"]
+
+pub trait Trait<T: ?Sized> {
+    #[rustc_symbol_name]
+    //[legacy]~^ ERROR symbol-name(_ZN8ty_alias5Trait6method
+    //[legacy]~| ERROR demangling(ty_alias::Trait::method::ha7
+    //[legacy]~| ERROR demangling-alt(ty_alias::Trait::method)
+     //[v0]~^^^^ ERROR symbol-name(_RNvYpINtCs7cCwHY5bdWN_8ty_alias5TraitpE6methodB6_)
+        //[v0]~| ERROR demangling(<_ as ty_alias[53e789f59d55e7ab]::Trait<_>>::method)
+        //[v0]~| ERROR demangling-alt(<_ as ty_alias::Trait<_>>::method)
+    fn method() -> &'static ();
+}
+
+pub struct Foo<T>(T);
+impl<T: std::ops::Deref> Trait<T::Target> for Foo<T> {
+    #[rustc_symbol_name]
+    //[legacy]~^ ERROR symbol-name(_ZN118_$LT$ty_alias..Foo$LT$T$GT$$u20$as$u20$ty_alias..Trait$LT$$LT$T$u20$as$u20$core..ops..deref..Deref$GT$..Target$GT$$GT$6method17
+    //[legacy]~| ERROR demangling(<ty_alias::Foo<T> as ty_alias::Trait<<T as core::ops::deref::Deref>::Target>>::method::he3
+    //[legacy]~| ERROR demangling-alt(<ty_alias::Foo<T> as ty_alias::Trait<<T as core::ops::deref::Deref>::Target>>::method)
+     //[v0]~^^^^ ERROR symbol-name(_RNvXINICs7cCwHY5bdWN_8ty_alias0pEINtB5_3FoopEINtB5_5TraitNtYpNtNtNtCskRLgSi4TGgx_4core3ops5deref5Deref6TargetE6methodB5_)
+        //[v0]~| ERROR demangling(<ty_alias[53e789f59d55e7ab]::Foo<_> as ty_alias[53e789f59d55e7ab]::Trait<<_ as core[f30d6cf379d2fe73]::ops::deref::Deref>::Target>>::method)
+        //[v0]~| ERROR demangling-alt(<ty_alias::Foo<_> as ty_alias::Trait<<_ as core::ops::deref::Deref>::Target>>::method)
+    fn method() -> &'static () {
+        static FOO: () = ();
+        &FOO
+    }
+}

src/test/ui/symbol-names/ty-alias.v0.stderr

@@ -0,0 +1,38 @@
+error: symbol-name(_RNvYpINtCsCRATE_HASH_8ty_alias5TraitpE6methodB<REF>_)
+  --> $DIR/ty-alias.rs:11:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<_ as ty_alias[53e789f59d55e7ab]::Trait<_>>::method)
+  --> $DIR/ty-alias.rs:11:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<_ as ty_alias::Trait<_>>::method)
+  --> $DIR/ty-alias.rs:11:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: symbol-name(_RNvXINICsCRATE_HASH_8ty_alias0pEINtB<REF>_3FoopEINtB<REF>_5TraitNtYpNtNtNtCsCRATE_HASH_4core3ops5deref5Deref6TargetE6methodB<REF>_)
+  --> $DIR/ty-alias.rs:23:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling(<ty_alias[53e789f59d55e7ab]::Foo<_> as ty_alias[53e789f59d55e7ab]::Trait<<_ as core[f30d6cf379d2fe73]::ops::deref::Deref>::Target>>::method)
+  --> $DIR/ty-alias.rs:23:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: demangling-alt(<ty_alias::Foo<_> as ty_alias::Trait<<_ as core::ops::deref::Deref>::Target>>::method)
+  --> $DIR/ty-alias.rs:23:5
+   |
+LL |     #[rustc_symbol_name]
+   |     ^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 6 previous errors
+