Update issue tracking comments to use actual URLs

tests/ui/imports/extern-crate-alias-impl-method.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#14422
+// issue: <https://github.com/rust-lang/rust/issues/14422>
 // Test that we can call an inherently implemented method via aliasing from an extern crate.
 //@ run-pass
 #![allow(non_snake_case)]

tests/ui/imports/extern-crate-indirect-fn-ptr.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#13620
+// issue: <https://github.com/rust-lang/rust/issues/13620>
 // Test cross crate resolution of an indirect function pointer
 //@ run-pass
 //@ aux-build:extern-crate-indirect-fn-ptr-aux-1.rs

tests/ui/imports/extern-crate-no-prefer-dynamic.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#14344
+// issue: <https://github.com/rust-lang/rust/issues/14344>
 // Test that we can depend on an `no-prefer-dynamic` crate.
 //@ run-pass
 //@ aux-build:extern-crate-no-prefer-dynamic-aux-1.rs

tests/ui/imports/extern-transmute.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#15562
+// issue: <https://github.com/rust-lang/rust/issues/15562>
 // Test resolution of `transmute` in an extern block to rust intrinsics.
 //@ run-pass
 //@ aux-build:extern-transmute-aux.rs

tests/ui/imports/typeid-cross-crate.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#13507
+// issue: <https://github.com/rust-lang/rust/issues/13507>
 // Test cross-crate TypeId stability
 //@ run-pass
 #![allow(unused_imports)]

tests/ui/imports/unused-cross-crate-import.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#12612
+// issue: <https://github.com/rust-lang/rust/issues/12612>
 // Test that unused `use` declarations involving multiple external crates are handled properly.
 //@ run-pass
 #![allow(unused_imports)]

tests/ui/imports/unused-extern-crate.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#11224
+// issue: <https://github.com/rust-lang/rust/issues/11224>
 // Test that an unused `extern crate` declaration does not crash the compiler.
 //@ run-pass
 //@ aux-build:unused-extern-crate-aux.rs

tests/ui/lint/missing-docs-private-trait.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#11592
+// issue: <https://github.com/rust-lang/rust/issues/11592>
 // Test that the `missing_docs` lint does not trigger for a private trait.
 //@ check-pass
 //! Ensure the private trait Bar isn't complained about.

tests/ui/pattern/box-pattern-nested.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#11552
+// issue: <https://github.com/rust-lang/rust/issues/11552>
 // Test nested box pattern matching inside a larger `match` statement.
 //@ run-pass
 #![feature(box_patterns)]

tests/ui/pattern/tuple-struct-cross-crate.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#11508
+// issue: <https://github.com/rust-lang/rust/issues/11508>
 // Test pattern matching on a tuple struct defined in an external crate.
 //@ run-pass
 //@ aux-build:tuple-struct-cross-crate-aux.rs

tests/ui/typeck/infer-struct-with-trait-object.rs

@@ -1,4 +1,4 @@
-// issue: rust-lang/rust#11677
+// issue: <https://github.com/rust-lang/rust/issues/11677>
 // Test that type inference works correctly for struct fields containing trait objects.
 //@ run-pass
 #![allow(unused_imports)]