Add feature gate tests for swift_abi

Author: nvzqz

src/test/ui/feature-gates/feature-gate-abi.rs

@@ -7,6 +7,7 @@
 // gate-test-abi_ptx
 // gate-test-abi_x86_interrupt
 // gate-test-abi_amdgpu_kernel
+// gate-test-abi_swift
 
 // Functions
 extern "rust-intrinsic" fn f1() {} //~ ERROR intrinsics are subject to change
@@ -20,6 +21,7 @@ extern "ptx-kernel" fn f6() {} //~ ERROR PTX ABIs are experimental and subject t
 extern "x86-interrupt" fn f7() {} //~ ERROR x86-interrupt ABI is experimental
 extern "thiscall" fn f8() {} //~ ERROR thiscall is experimental and subject to change
 extern "amdgpu-kernel" fn f9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
+extern "Swift" fn f10() {} //~ ERROR Swift ABI is experimental and subject to change
 
 // Methods in trait definition
 trait Tr {
@@ -34,6 +36,7 @@ trait Tr {
     extern "x86-interrupt" fn m7(); //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn m8(); //~ ERROR thiscall is experimental and subject to change
     extern "amdgpu-kernel" fn m9(); //~ ERROR amdgpu-kernel ABI is experimental and subject to change
+    extern "Swift" fn m10(); //~ ERROR Swift ABI is experimental and subject to change
 
     extern "vectorcall" fn dm3() {} //~ ERROR vectorcall is experimental and subject to change
     extern "rust-call" fn dm4() {} //~ ERROR rust-call ABI is subject to change
@@ -42,6 +45,7 @@ trait Tr {
     extern "x86-interrupt" fn dm7() {} //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn dm8() {} //~ ERROR thiscall is experimental and subject to change
     extern "amdgpu-kernel" fn dm9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
+    extern "Swift" fn dm10() {} //~ ERROR Swift ABI is experimental and subject to change
 }
 
 struct S;
@@ -59,6 +63,7 @@ impl Tr for S {
     extern "x86-interrupt" fn m7() {} //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn m8() {} //~ ERROR thiscall is experimental and subject to change
     extern "amdgpu-kernel" fn m9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
+    extern "Swift" fn m10() {} //~ ERROR Swift ABI is experimental and subject to change
 }
 
 // Methods in inherent impl
@@ -74,6 +79,7 @@ impl S {
     extern "x86-interrupt" fn im7() {} //~ ERROR x86-interrupt ABI is experimental
     extern "thiscall" fn im8() {} //~ ERROR thiscall is experimental and subject to change
     extern "amdgpu-kernel" fn im9() {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
+    extern "Swift" fn im10() {} //~ ERROR Swift ABI is experimental and subject to change
 }
 
 // Function pointer types
@@ -86,6 +92,7 @@ type A6 = extern "ptx-kernel" fn (); //~ ERROR PTX ABIs are experimental and sub
 type A7 = extern "x86-interrupt" fn(); //~ ERROR x86-interrupt ABI is experimental
 type A8 = extern "thiscall" fn(); //~ ERROR thiscall is experimental and subject to change
 type A9 = extern "amdgpu-kernel" fn(); //~ ERROR amdgpu-kernel ABI is experimental and subject to change
+type A10 = extern "Swift" fn(); //~ ERROR Swift ABI is experimental and subject to change
 
 // Foreign modules
 extern "rust-intrinsic" {} //~ ERROR intrinsics are subject to change
@@ -97,5 +104,6 @@ extern "ptx-kernel" {} //~ ERROR PTX ABIs are experimental and subject to change
 extern "x86-interrupt" {} //~ ERROR x86-interrupt ABI is experimental
 extern "thiscall" {} //~ ERROR thiscall is experimental and subject to change
 extern "amdgpu-kernel" {} //~ ERROR amdgpu-kernel ABI is experimental and subject to change
+extern "Swift" {} //~ ERROR Swift ABI is experimental and subject to change
 
 fn main() {}