Mark missing_fragment_specifier as FutureReleaseErrorReportInDeps

We are moving toward forbidding `missing_fragment_specifier` either in
edition 2024 or unconditionally. Make a first step toward this by
ensuring crates that rely on the old behavior are reported when used as
dependencies.

Tracking issue: <https://github.com/rust-lang/rust/issues/128143>

compiler/rustc_lint_defs/src/builtin.rs

@@ -1424,7 +1424,7 @@
     Deny,
     "detects missing fragment specifiers in unused `macro_rules!` patterns",
     @future_incompatible = FutureIncompatibleInfo {
-        reason: FutureIncompatibilityReason::FutureReleaseErrorDontReportInDeps,
+        reason: FutureIncompatibilityReason::FutureReleaseErrorReportInDeps,
         reference: "issue #40107 <https://github.com/rust-lang/rust/issues/40107>",
     };
 }

tests/ui/lint/expansion-time.stderr

@@ -55,6 +55,21 @@ LL | #[warn(incomplete_include)]
 warning: 4 warnings emitted
 
 Future incompatibility report: Future breakage diagnostic:
+warning: missing fragment specifier
+  --> $DIR/expansion-time.rs:9:19
+   |
+LL | macro_rules! m { ($i) => {} }
+   |                   ^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+note: the lint level is defined here
+  --> $DIR/expansion-time.rs:8:8
+   |
+LL | #[warn(missing_fragment_specifier)]
+   |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Future breakage diagnostic:
 warning: use of unstable library feature 'test': `bench` is a part of custom test frameworks which are unstable
   --> $DIR/expansion-time.rs:14:7
    |

tests/ui/macros/issue-39404.stderr

@@ -10,3 +10,14 @@ LL | macro_rules! m { ($i) => {} }
 
 error: aborting due to 1 previous error
 
+Future incompatibility report: Future breakage diagnostic:
+error: missing fragment specifier
+  --> $DIR/issue-39404.rs:3:19
+   |
+LL | macro_rules! m { ($i) => {} }
+   |                   ^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+   = note: `#[deny(missing_fragment_specifier)]` on by default
+

tests/ui/macros/macro-match-nonterminal.stderr

@@ -25,3 +25,25 @@ LL |     ($a, $b) => {
 
 error: aborting due to 3 previous errors
 
+Future incompatibility report: Future breakage diagnostic:
+error: missing fragment specifier
+  --> $DIR/macro-match-nonterminal.rs:2:8
+   |
+LL |     ($a, $b) => {
+   |        ^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+   = note: `#[deny(missing_fragment_specifier)]` on by default
+
+Future breakage diagnostic:
+error: missing fragment specifier
+  --> $DIR/macro-match-nonterminal.rs:2:10
+   |
+LL |     ($a, $b) => {
+   |          ^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+   = note: `#[deny(missing_fragment_specifier)]` on by default
+

tests/ui/macros/macro-missing-fragment-deduplication.stderr

@@ -16,3 +16,14 @@ LL |     ($name) => {}
 
 error: aborting due to 2 previous errors
 
+Future incompatibility report: Future breakage diagnostic:
+error: missing fragment specifier
+  --> $DIR/macro-missing-fragment-deduplication.rs:4:6
+   |
+LL |     ($name) => {}
+   |      ^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+   = note: `#[deny(missing_fragment_specifier)]` on by default
+

tests/ui/macros/macro-missing-fragment.stderr

@@ -38,3 +38,48 @@ LL |     ( $name ) => {};
 
 error: aborting due to 1 previous error; 3 warnings emitted
 
+Future incompatibility report: Future breakage diagnostic:
+warning: missing fragment specifier
+  --> $DIR/macro-missing-fragment.rs:4:20
+   |
+LL |     ( $( any_token $field_rust_type )* ) => {};
+   |                    ^^^^^^^^^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+note: the lint level is defined here
+  --> $DIR/macro-missing-fragment.rs:1:9
+   |
+LL | #![warn(missing_fragment_specifier)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Future breakage diagnostic:
+warning: missing fragment specifier
+  --> $DIR/macro-missing-fragment.rs:12:7
+   |
+LL |     ( $name ) => {};
+   |       ^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+note: the lint level is defined here
+  --> $DIR/macro-missing-fragment.rs:1:9
+   |
+LL | #![warn(missing_fragment_specifier)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+Future breakage diagnostic:
+warning: missing fragment specifier
+  --> $DIR/macro-missing-fragment.rs:18:7
+   |
+LL |     ( $name ) => {};
+   |       ^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+note: the lint level is defined here
+  --> $DIR/macro-missing-fragment.rs:1:9
+   |
+LL | #![warn(missing_fragment_specifier)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+

tests/ui/parser/macro/issue-33569.stderr

@@ -28,3 +28,14 @@ LL |     { $+ } => {
 
 error: aborting due to 4 previous errors
 
+Future incompatibility report: Future breakage diagnostic:
+error: missing fragment specifier
+  --> $DIR/issue-33569.rs:2:8
+   |
+LL |     { $+ } => {
+   |        ^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #40107 <https://github.com/rust-lang/rust/issues/40107>
+   = note: `#[deny(missing_fragment_specifier)]` on by default
+