Auto merge of #143833 - scottmcm:final-mcp-838, r=compiler-errors

Ban projecting into SIMD types [MCP838]

Closes https://github.com/rust-lang/compiler-team/issues/838

The actual compiler change here is tiny; there's just a bazillion tests to update.

~~Since I'm sure I've missed some, for now~~
~~r ghost~~

try-job: test-various
try-job: x86_64-gnu-nopt

1 files changed, 11 insertions, 5 deletions

diff --git a/tests/ui/simd/intrinsic/generic-cast-pointer-width.rs b/tests/ui/simd/intrinsic/generic-cast-pointer-width.rs
index ea34e9ffeb8..594d1d25d16 100644
--- a/tests/ui/simd/intrinsic/generic-cast-pointer-width.rs
+++ b/tests/ui/simd/intrinsic/generic-cast-pointer-width.rs
@@ -1,18 +1,24 @@
 //@ run-pass
 #![feature(repr_simd, core_intrinsics)]
 
+#[path = "../../../auxiliary/minisimd.rs"]
+mod minisimd;
+use minisimd::*;
+
 use std::intrinsics::simd::simd_cast;
 
-#[derive(Copy, Clone)]
-#[repr(simd)]
-struct V<T>([T; 4]);
+type V<T> = Simd<T, 4>;
 
 fn main() {
-    let u = V::<usize>([0, 1, 2, 3]);
+    let u: V::<usize> = Simd([0, 1, 2, 3]);
     let uu32: V<u32> = unsafe { simd_cast(u) };
     let ui64: V<i64> = unsafe { simd_cast(u) };
 
-    for (u, (uu32, ui64)) in u.0.iter().zip(uu32.0.iter().zip(ui64.0.iter())) {
+    for (u, (uu32, ui64)) in u
+        .as_array()
+        .iter()
+        .zip(uu32.as_array().iter().zip(ui64.as_array().iter()))
+    {
         assert_eq!(*u as u32, *uu32);
         assert_eq!(*u as i64, *ui64);
     }