Fix trybuild drift

Author: meithecatte

test_suite/ui/invalid_name_in_default.stderr

@@ -1,5 +1,5 @@
 error[E0599]: no variant or associated item named `C` found for enum `Test` in the current scope
- --> $DIR/invalid_name_in_default.rs:3:26
+ --> ui/invalid_name_in_default.rs:3:26
   |
 3 | #[bitflags(default = A | C)]
   |                          ^
@@ -8,4 +8,4 @@ error[E0599]: no variant or associated item named `C` found for enum `Test` in t
   |                          help: there is a variant with a similar name: `A`
 ...
 6 | enum Test {
-  | --------- variant or associated item `C` not found here
+  | --------- variant or associated item `C` not found for this enum

test_suite/ui/literal_out_of_range.stderr

@@ -1,9 +1,9 @@
 error: literal out of range for `u64`
- --> $DIR/literal_out_of_range.rs:5:17
+ --> ui/literal_out_of_range.rs:5:17
   |
 5 |     BigNumber = 0xdeadbeefcafebabe1337,
   |                 ^^^^^^^^^^^^^^^^^^^^^^
   |
-  = note: `#[deny(overflowing_literals)]` on by default
   = note: the literal `0xdeadbeefcafebabe1337` (decimal `1051570404360395033547575`) does not fit into the type `u64` and will become `13758438582043677495u64`
   = help: consider using the type `u128` instead
+  = note: `#[deny(overflowing_literals)]` on by default

test_suite/ui/overlapping_flags.stderr

@@ -1,7 +1,9 @@
-error[E0081]: discriminant value `1` already exists
- --> $DIR/overlapping_flags.rs:6:23
+error[E0081]: discriminant value `1` assigned more than once
+ --> ui/overlapping_flags.rs:4:1
   |
+4 | enum Foo {
+  | ^^^^^^^^
 5 |     SomeFlag = 1 << 0,
-  |                ------ first use of `1`
+  |                ------ `1` assigned here
 6 |     OverlappingFlag = 1 << 0,
-  |                       ^^^^^^ enum already has `1`
+  |                       ------ `1` assigned here