Rollup merge of #126843 - workingjubilee:allow-variadics-in-c-unwind, r=nnethercote

Allow "C-unwind" fn to have C variadics

Fixes #126836

2 files changed, 42 insertions, 42 deletions

diff --git a/tests/ui/parser/variadic-ffi-semantic-restrictions.rs b/tests/ui/parser/variadic-ffi-semantic-restrictions.rs
index 11126dbc65d..1cd6d13d56b 100644
--- a/tests/ui/parser/variadic-ffi-semantic-restrictions.rs
+++ b/tests/ui/parser/variadic-ffi-semantic-restrictions.rs
@@ -4,29 +4,29 @@
 fn main() {}
 
 fn f1_1(x: isize, ...) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 
 fn f1_2(...) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 
 extern "C" fn f2_1(x: isize, ...) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 
 extern "C" fn f2_2(...) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 
 extern "C" fn f2_3(..., x: isize) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 //~| ERROR `...` must be the last argument of a C-variadic function
 
 extern "C" fn f3_1(x: isize, ...) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 
 extern "C" fn f3_2(...) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 
 extern "C" fn f3_3(..., x: isize) {}
-//~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 //~| ERROR `...` must be the last argument of a C-variadic function
 
 const unsafe extern "C" fn f4_1(x: isize, ...) {}
@@ -35,12 +35,12 @@ const unsafe extern "C" fn f4_1(x: isize, ...) {}
 
 const extern "C" fn f4_2(x: isize, ...) {}
 //~^ ERROR functions cannot be both `const` and C-variadic
-//~| ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~| ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 //~| ERROR destructor of `VaListImpl<'_>` cannot be evaluated at compile-time
 
 const extern "C" fn f4_3(..., x: isize, ...) {}
 //~^ ERROR functions cannot be both `const` and C-variadic
-//~| ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+//~| ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
 //~| ERROR `...` must be the last argument of a C-variadic function
 
 extern "C" {
@@ -52,34 +52,34 @@ struct X;
 
 impl X {
     fn i_f1(x: isize, ...) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     fn i_f2(...) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     fn i_f3(..., x: isize, ...) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     //~| ERROR `...` must be the last argument of a C-variadic function
     fn i_f4(..., x: isize, ...) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     //~| ERROR `...` must be the last argument of a C-variadic function
     const fn i_f5(x: isize, ...) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     //~| ERROR functions cannot be both `const` and C-variadic
     //~| ERROR destructor of `VaListImpl<'_>` cannot be evaluated at compile-time
 }
 
 trait T {
     fn t_f1(x: isize, ...) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     fn t_f2(x: isize, ...);
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     fn t_f3(...) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     fn t_f4(...);
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     fn t_f5(..., x: isize) {}
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     //~| ERROR `...` must be the last argument of a C-variadic function
     fn t_f6(..., x: isize);
-    //~^ ERROR only foreign or `unsafe extern "C"` functions may be C-variadic
+    //~^ ERROR only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
     //~| ERROR `...` must be the last argument of a C-variadic function
 }
diff --git a/tests/ui/parser/variadic-ffi-semantic-restrictions.stderr b/tests/ui/parser/variadic-ffi-semantic-restrictions.stderr
index f71e3863440..b740cef0200 100644
--- a/tests/ui/parser/variadic-ffi-semantic-restrictions.stderr
+++ b/tests/ui/parser/variadic-ffi-semantic-restrictions.stderr
@@ -1,22 +1,22 @@
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:6:19
    |
 LL | fn f1_1(x: isize, ...) {}
    |                   ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:9:9
    |
 LL | fn f1_2(...) {}
    |         ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:12:30
    |
 LL | extern "C" fn f2_1(x: isize, ...) {}
    |                              ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:15:20
    |
 LL | extern "C" fn f2_2(...) {}
@@ -28,19 +28,19 @@ error: `...` must be the last argument of a C-variadic function
 LL | extern "C" fn f2_3(..., x: isize) {}
    |                    ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:18:20
    |
 LL | extern "C" fn f2_3(..., x: isize) {}
    |                    ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:22:30
    |
 LL | extern "C" fn f3_1(x: isize, ...) {}
    |                              ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:25:20
    |
 LL | extern "C" fn f3_2(...) {}
@@ -52,7 +52,7 @@ error: `...` must be the last argument of a C-variadic function
 LL | extern "C" fn f3_3(..., x: isize) {}
    |                    ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:28:20
    |
 LL | extern "C" fn f3_3(..., x: isize) {}
@@ -70,7 +70,7 @@ error: functions cannot be both `const` and C-variadic
 LL | const extern "C" fn f4_2(x: isize, ...) {}
    | ^^^^^ `const` because of this      ^^^ C-variadic because of this
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:36:36
    |
 LL | const extern "C" fn f4_2(x: isize, ...) {}
@@ -91,7 +91,7 @@ LL | const extern "C" fn f4_3(..., x: isize, ...) {}
    | |                        C-variadic because of this
    | `const` because of this
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:41:26
    |
 LL | const extern "C" fn f4_3(..., x: isize, ...) {}
@@ -103,13 +103,13 @@ error: `...` must be the last argument of a C-variadic function
 LL |     fn e_f2(..., x: isize);
    |             ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:54:23
    |
 LL |     fn i_f1(x: isize, ...) {}
    |                       ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:56:13
    |
 LL |     fn i_f2(...) {}
@@ -121,7 +121,7 @@ error: `...` must be the last argument of a C-variadic function
 LL |     fn i_f3(..., x: isize, ...) {}
    |             ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:58:13
    |
 LL |     fn i_f3(..., x: isize, ...) {}
@@ -133,7 +133,7 @@ error: `...` must be the last argument of a C-variadic function
 LL |     fn i_f4(..., x: isize, ...) {}
    |             ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:61:13
    |
 LL |     fn i_f4(..., x: isize, ...) {}
@@ -147,31 +147,31 @@ LL |     const fn i_f5(x: isize, ...) {}
    |     |
    |     `const` because of this
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:64:29
    |
 LL |     const fn i_f5(x: isize, ...) {}
    |                             ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:71:23
    |
 LL |     fn t_f1(x: isize, ...) {}
    |                       ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:73:23
    |
 LL |     fn t_f2(x: isize, ...);
    |                       ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:75:13
    |
 LL |     fn t_f3(...) {}
    |             ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:77:13
    |
 LL |     fn t_f4(...);
@@ -183,7 +183,7 @@ error: `...` must be the last argument of a C-variadic function
 LL |     fn t_f5(..., x: isize) {}
    |             ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:79:13
    |
 LL |     fn t_f5(..., x: isize) {}
@@ -195,7 +195,7 @@ error: `...` must be the last argument of a C-variadic function
 LL |     fn t_f6(..., x: isize);
    |             ^^^
 
-error: only foreign or `unsafe extern "C"` functions may be C-variadic
+error: only foreign, `unsafe extern "C"`, or `unsafe extern "C-unwind"` functions may have a C-variadic arg
   --> $DIR/variadic-ffi-semantic-restrictions.rs:82:13
    |
 LL |     fn t_f6(..., x: isize);