Add issue links and blessed error files

tests/ui/auto-traits/distinct-type-tuple-by-negative-impl.rs

@@ -1,3 +1,4 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/29516>
 //@ check-pass
 #![feature(auto_traits)]
 #![feature(negative_impls)]

tests/ui/binding/ref-in-let-lhs-in-field.rs

@@ -1,3 +1,4 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/3874>
 //@ build-pass
 #![allow(dead_code)]
 

tests/ui/feature-gates/feature-gate-check-nested-macro-invocation.rs

@@ -1,3 +1,4 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/32782>
 macro_rules! bar (
     () => ()
 );

tests/ui/feature-gates/feature-gate-check-nested-macro-invocation.stderr

@@ -1,5 +1,5 @@
 error[E0658]: allow_internal_unstable side-steps feature gating and stability checks
-  --> $DIR/issue-32782.rs:7:9
+  --> $DIR/feature-gate-check-nested-macro-invocation.rs:8:9
    |
 LL |         #[allow_internal_unstable()]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -12,7 +12,7 @@ LL | foo!();
    = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error: `#[allow_internal_unstable]` attribute cannot be used on macro calls
-  --> $DIR/issue-32782.rs:7:9
+  --> $DIR/feature-gate-check-nested-macro-invocation.rs:8:9
    |
 LL |         #[allow_internal_unstable()]
    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/ui/pattern/match-errors-derived-error-suppression.rs

@@ -1,3 +1,4 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/5100>
 //@ dont-require-annotations: NOTE
 
 #![feature(box_patterns)]

tests/ui/pattern/match-errors-derived-error-suppression.stderr

@@ -1,5 +1,5 @@
 error[E0308]: mismatched types
-  --> $DIR/issue-5100.rs:9:9
+  --> $DIR/match-errors-derived-error-suppression.rs:10:9
    |
 LL |     match (true, false) {
    |           ------------- this expression has type `(bool, bool)`
@@ -10,7 +10,7 @@ LL |         A::B => (),
                found enum `A`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-5100.rs:18:9
+  --> $DIR/match-errors-derived-error-suppression.rs:19:9
    |
 LL |     match (true, false) {
    |           ------------- this expression has type `(bool, bool)`
@@ -21,7 +21,7 @@ LL |         (true, false, false) => ()
               found tuple `(_, _, _)`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-5100.rs:26:9
+  --> $DIR/match-errors-derived-error-suppression.rs:27:9
    |
 LL |     match (true, false) {
    |           ------------- this expression has type `(bool, bool)`
@@ -32,7 +32,7 @@ LL |         (true, false, false) => ()
               found tuple `(_, _, _)`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-5100.rs:34:9
+  --> $DIR/match-errors-derived-error-suppression.rs:35:9
    |
 LL |     match (true, false) {
    |           ------------- this expression has type `(bool, bool)`
@@ -43,7 +43,7 @@ LL |         box (true, false) => ()
              found struct `Box<_>`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-5100.rs:41:9
+  --> $DIR/match-errors-derived-error-suppression.rs:42:9
    |
 LL |     match (true, false) {
    |           ------------- this expression has type `(bool, bool)`
@@ -54,13 +54,13 @@ LL |         &(true, false) => ()
            found reference `&_`
 
 error[E0618]: expected function, found `(char, char)`
-  --> $DIR/issue-5100.rs:49:14
+  --> $DIR/match-errors-derived-error-suppression.rs:50:14
    |
 LL |     let v = [('a', 'b')
    |              ^^^^^^^^^^- help: consider separating array elements with a comma: `,`
 
 error[E0308]: mismatched types
-  --> $DIR/issue-5100.rs:56:19
+  --> $DIR/match-errors-derived-error-suppression.rs:57:19
    |
 LL |     let x: char = true;
    |            ----   ^^^^ expected `char`, found `bool`

tests/ui/pattern/match-struct-var-having-boxed-field.rs

@@ -1,3 +1,4 @@
+//! Regression test for <https://github.com/rust-lang/rust/issues/21033>
 //@ run-pass
 #![allow(unused_mut)]
 #![allow(unused_variables)]