Fix undesirable fallout

compile-fail-fulldeps/proc-macro/proc-macro-attributes.rs - resolution change for derive helper attributes with the same name as derive itself
run-pass/macro-comma-support.rs - indeterminate resolutions for macros in expression positions
ui/issues/issue-49074.rs - diagnostics regression, not enough recovery to report the second error
ui/object-lifetime/object-lifetime-default.stderr - unstable diagnostics?

src/test/ui/issues/issue-49074.rs

@@ -20,5 +20,4 @@ mod foo {
 
 fn main() {
    bar!();
-   //~^ ERROR cannot find macro `bar!`
 }

src/test/ui/issues/issue-49074.stderr

@@ -1,11 +1,3 @@
-error: cannot find macro `bar!` in this scope
-  --> $DIR/issue-49074.rs:22:4
-   |
-LL |    bar!();
-   |    ^^^
-   |
-   = help: have you added the `#[macro_use]` on the module/import?
-
 error[E0658]: The attribute `marco_use` is currently unknown to the compiler and may have meaning added to it in the future (see issue #29642)
   --> $DIR/issue-49074.rs:13:1
    |
@@ -14,6 +6,6 @@ LL | #[marco_use] // typo
    |
    = help: add #![feature(custom_attribute)] to the crate attributes to enable
 
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
 For more information about this error, try `rustc --explain E0658`.

src/test/ui/object-lifetime/object-lifetime-default.stderr

@@ -1,32 +1,8 @@
-error: BaseDefault
-  --> $DIR/object-lifetime-default.rs:16:1
+error: 'a,Ambiguous
+  --> $DIR/object-lifetime-default.rs:34:1
    |
-LL | struct A<T>(T); //~ ERROR BaseDefault
-   | ^^^^^^^^^^^^^^^
-
-error: BaseDefault
-  --> $DIR/object-lifetime-default.rs:19:1
-   |
-LL | struct B<'a,T>(&'a (), T); //~ ERROR BaseDefault
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: 'a
-  --> $DIR/object-lifetime-default.rs:22:1
-   |
-LL | struct C<'a,T:'a>(&'a T); //~ ERROR 'a
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: Ambiguous
-  --> $DIR/object-lifetime-default.rs:25:1
-   |
-LL | struct D<'a,'b,T:'a+'b>(&'a T, &'b T); //~ ERROR Ambiguous
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-
-error: 'b
-  --> $DIR/object-lifetime-default.rs:28:1
-   |
-LL | struct E<'a,'b:'a,T:'b>(&'a T, &'b T); //~ ERROR 'b
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | struct G<'a,'b,T:'a,U:'a+'b>(&'a T, &'b U); //~ ERROR 'a,Ambiguous
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: 'a,'b
   --> $DIR/object-lifetime-default.rs:31:1
@@ -34,11 +10,35 @@ error: 'a,'b
 LL | struct F<'a,'b,T:'a,U:'b>(&'a T, &'b U); //~ ERROR 'a,'b
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: 'a,Ambiguous
-  --> $DIR/object-lifetime-default.rs:34:1
+error: 'b
+  --> $DIR/object-lifetime-default.rs:28:1
    |
-LL | struct G<'a,'b,T:'a,U:'a+'b>(&'a T, &'b U); //~ ERROR 'a,Ambiguous
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | struct E<'a,'b:'a,T:'b>(&'a T, &'b T); //~ ERROR 'b
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: Ambiguous
+  --> $DIR/object-lifetime-default.rs:25:1
+   |
+LL | struct D<'a,'b,T:'a+'b>(&'a T, &'b T); //~ ERROR Ambiguous
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: 'a
+  --> $DIR/object-lifetime-default.rs:22:1
+   |
+LL | struct C<'a,T:'a>(&'a T); //~ ERROR 'a
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: BaseDefault
+  --> $DIR/object-lifetime-default.rs:19:1
+   |
+LL | struct B<'a,T>(&'a (), T); //~ ERROR BaseDefault
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: BaseDefault
+  --> $DIR/object-lifetime-default.rs:16:1
+   |
+LL | struct A<T>(T); //~ ERROR BaseDefault
+   | ^^^^^^^^^^^^^^^
 
 error: aborting due to 7 previous errors