expand: Remove `ParseSess::missing_fragment_specifiers`

It was used for deduplicating some errors for legacy code which are mostly deduplicated even without that, but at cost of global mutable state, which is not a good tradeoff.

6 files changed, 102 insertions, 7 deletions

diff --git a/src/test/ui/macros/macro-match-nonterminal.rs b/src/test/ui/macros/macro-match-nonterminal.rs
index b23e5c71c03..5d9eb55fee0 100644
--- a/src/test/ui/macros/macro-match-nonterminal.rs
+++ b/src/test/ui/macros/macro-match-nonterminal.rs
@@ -2,6 +2,8 @@ macro_rules! test {
     ($a, $b) => {
         //~^ ERROR missing fragment
         //~| ERROR missing fragment
+        //~| ERROR missing fragment
+        //~| WARN this was previously accepted
         //~| WARN this was previously accepted
         ()
     };
diff --git a/src/test/ui/macros/macro-match-nonterminal.stderr b/src/test/ui/macros/macro-match-nonterminal.stderr
index 674ce3434aa..48b9bc6ff6a 100644
--- a/src/test/ui/macros/macro-match-nonterminal.stderr
+++ b/src/test/ui/macros/macro-match-nonterminal.stderr
@@ -5,14 +5,23 @@ LL |     ($a, $b) => {
    |        ^
 
 error: missing fragment specifier
+  --> $DIR/macro-match-nonterminal.rs:2:8
+   |
+LL |     ($a, $b) => {
+   |        ^
+   |
+   = note: `#[deny(missing_fragment_specifier)]` on by default
+   = 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>
+
+error: missing fragment specifier
   --> $DIR/macro-match-nonterminal.rs:2:10
    |
 LL |     ($a, $b) => {
    |          ^^
    |
-   = note: `#[deny(missing_fragment_specifier)]` on by default
    = 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>
 
-error: aborting due to 2 previous errors
+error: aborting due to 3 previous errors
 
diff --git a/src/test/ui/macros/macro-missing-fragment-deduplication.rs b/src/test/ui/macros/macro-missing-fragment-deduplication.rs
new file mode 100644
index 00000000000..c1e6ba74647
--- /dev/null
+++ b/src/test/ui/macros/macro-missing-fragment-deduplication.rs
@@ -0,0 +1,15 @@
+// compile-flags: -Zdeduplicate-diagnostics=yes
+
+macro_rules! m {
+    ($name) => {}
+    //~^ ERROR missing fragment
+    //~| ERROR missing fragment
+    //~| WARN this was previously accepted
+}
+
+fn main() {
+    m!();
+    m!();
+    m!();
+    m!();
+}
diff --git a/src/test/ui/macros/macro-missing-fragment-deduplication.stderr b/src/test/ui/macros/macro-missing-fragment-deduplication.stderr
new file mode 100644
index 00000000000..7622ca054c8
--- /dev/null
+++ b/src/test/ui/macros/macro-missing-fragment-deduplication.stderr
@@ -0,0 +1,18 @@
+error: missing fragment specifier
+  --> $DIR/macro-missing-fragment-deduplication.rs:4:6
+   |
+LL |     ($name) => {}
+   |      ^^^^^
+
+error: missing fragment specifier
+  --> $DIR/macro-missing-fragment-deduplication.rs:4:6
+   |
+LL |     ($name) => {}
+   |      ^^^^^
+   |
+   = note: `#[deny(missing_fragment_specifier)]` on by default
+   = 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>
+
+error: aborting due to 2 previous errors
+
diff --git a/src/test/ui/macros/macro-missing-fragment.rs b/src/test/ui/macros/macro-missing-fragment.rs
index 1d0b0889b4c..210c85ebbf2 100644
--- a/src/test/ui/macros/macro-missing-fragment.rs
+++ b/src/test/ui/macros/macro-missing-fragment.rs
@@ -1,7 +1,26 @@
-macro_rules! m {
-    ( $( any_token $field_rust_type )* ) => {}; //~ ERROR missing fragment
+#![warn(missing_fragment_specifier)]
+
+macro_rules! used_arm {
+    ( $( any_token $field_rust_type )* ) => {};
+    //~^ ERROR missing fragment
+    //~| WARN missing fragment
+    //~| WARN this was previously accepted
+}
+
+macro_rules! used_macro_unused_arm {
+    () => {};
+    ( $name ) => {};
+    //~^ WARN missing fragment
+    //~| WARN this was previously accepted
+}
+
+macro_rules! unused_macro {
+    ( $name ) => {};
+    //~^ WARN missing fragment
+    //~| WARN this was previously accepted
 }
 
 fn main() {
-    m!();
+    used_arm!();
+    used_macro_unused_arm!();
 }
diff --git a/src/test/ui/macros/macro-missing-fragment.stderr b/src/test/ui/macros/macro-missing-fragment.stderr
index b7871c0ec3a..1bf6f04ec7f 100644
--- a/src/test/ui/macros/macro-missing-fragment.stderr
+++ b/src/test/ui/macros/macro-missing-fragment.stderr
@@ -1,8 +1,40 @@
 error: missing fragment specifier
-  --> $DIR/macro-missing-fragment.rs:2:20
+  --> $DIR/macro-missing-fragment.rs:4:20
    |
 LL |     ( $( any_token $field_rust_type )* ) => {};
    |                    ^^^^^^^^^^^^^^^^
 
-error: aborting due to previous error
+warning: missing fragment specifier
+  --> $DIR/macro-missing-fragment.rs:4:20
+   |
+LL |     ( $( any_token $field_rust_type )* ) => {};
+   |                    ^^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/macro-missing-fragment.rs:1:9
+   |
+LL | #![warn(missing_fragment_specifier)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = 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>
+
+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>
+
+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>
+
+error: aborting due to previous error; 3 warnings emitted