Add #[allow(improper_ctypes)] to slew of cases that need e.g. repr(C).

See also rust-lang/rust#53858.

src/test/ui/run-pass/extern/extern-pass-TwoU16s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct

src/test/ui/run-pass/extern/extern-pass-TwoU32s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct

src/test/ui/run-pass/extern/extern-pass-TwoU64s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct

src/test/ui/run-pass/extern/extern-pass-TwoU8s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc for ffi testing
 
 // Test a foreign function that accepts and returns a struct

src/test/ui/run-pass/extern/extern-return-TwoU16s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU16s {

src/test/ui/run-pass/extern/extern-return-TwoU32s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU32s {

src/test/ui/run-pass/extern/extern-return-TwoU64s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU64s {

src/test/ui/run-pass/extern/extern-return-TwoU8s.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 pub struct TwoU8s {

src/test/ui/run-pass/foreign/foreign-fn-with-byval.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // ignore-wasm32-bare no libc to test ffi with
 
 #[derive(Copy, Clone)]

src/test/ui/run-pass/issues/issue-3656.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // Issue #3656
 // Incorrect struct size computation in the FFI, because of not taking
 // the alignment of elements into account.

src/test/ui/run-pass/issues/issue-5754.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // pretty-expanded FIXME #23616
 
 struct TwoDoubles {

src/test/ui/run-pass/issues/issue-6470.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 // run-pass
+#![allow(improper_ctypes)]
+
 // pretty-expanded FIXME #23616
 #![allow(non_snake_case)]