Auto merge of #28060 - GuillaumeGomez:patch-3, r=Manishearth

Part of #24407

r? @Manishearth

Author: bors

src/librustc_resolve/diagnostics.rs

@@ -397,6 +397,55 @@ impl Bar {
 ```
 "##,
 
+E0411: r##"
+The `Self` keyword was used outside an impl or a trait. Erroneous
+code example:
+
+```
+<Self>::foo; // error: use of `Self` outside of an impl or trait
+```
+
+The `Self` keyword represents the current type, which explains why it
+can only be used inside an impl or a trait. It gives access to the
+associated items of a type:
+
+```
+trait Foo {
+    type Bar;
+}
+
+trait Baz : Foo {
+    fn bar() -> Self::Bar; // like this
+}
+```
+
+However, be careful when two types has a common associated type:
+
+```
+trait Foo {
+    type Bar;
+}
+
+trait Foo2 {
+    type Bar;
+}
+
+trait Baz : Foo + Foo2 {
+    fn bar() -> Self::Bar;
+    // error: ambiguous associated type `Bar` in bounds of `Self`
+}
+```
+
+This problem can be solved by specifying from which trait we want
+to use the `Bar` type:
+
+```
+trait Baz : Foo + Foo2 {
+    fn bar() -> <Self as Foo>::Bar; // ok!
+}
+```
+"##,
+
 E0412: r##"
 An undeclared type name was used. Example of erroneous codes:
 
@@ -823,8 +872,8 @@ impl Foo for i32 {}
 }
 
 register_diagnostics! {
-    E0153, // called no where
-    E0157, // called from no where
+//  E0153, unused error code
+//  E0157, unused error code
     E0254, // import conflicts with imported crate in this module
     E0257,
     E0258,
@@ -835,7 +884,6 @@ register_diagnostics! {
     E0409, // variable is bound with different mode in pattern # than in
            // pattern #1
     E0410, // variable from pattern is not bound in pattern 1
-    E0411, // use of `Self` outside of an impl or trait
     E0414, // only irrefutable patterns allowed here
     E0418, // is not an enum variant, struct or const
     E0420, // is not an associated const

src/librustc_typeck/diagnostics.rs

@@ -3020,6 +3020,144 @@ parameters. You can read more about it in the API documentation:
 https://doc.rust-lang.org/std/marker/struct.PhantomData.html
 "##,
 
+E0439: r##"
+The length of the platform-intrinsic function `simd_shuffle`
+wasn't specified. Erroneous code example:
+
+```
+extern "platform-intrinsic" {
+    fn simd_shuffle<A,B>(a: A, b: A, c: [u32; 8]) -> B;
+    // error: invalid `simd_shuffle`, needs length: `simd_shuffle`
+}
+```
+
+The `simd_shuffle` function needs the length of the array passed as
+last parameter in its name. Example:
+
+```
+extern "platform-intrinsic" {
+    fn simd_shuffle8<A,B>(a: A, b: A, c: [u32; 8]) -> B;
+}
+```
+"##,
+
+E0440: r##"
+A platform-specific intrinsic function has the wrong number of type
+parameters. Erroneous code example:
+
+```
+#[repr(simd)]
+struct f64x2(f64, f64);
+
+extern "platform-intrinsic" {
+    fn x86_mm_movemask_pd<T>(x: f64x2) -> i32;
+    // error: platform-specific intrinsic has wrong number of type
+    //        parameters
+}
+```
+
+Please refer to the function declaration to see if it corresponds
+with yours. Example:
+
+```
+#[repr(simd)]
+struct f64x2(f64, f64);
+
+extern "platform-intrinsic" {
+    fn x86_mm_movemask_pd(x: f64x2) -> i32;
+}
+```
+"##,
+
+E0441: r##"
+An unknown platform-specific intrinsic function was used. Erroneous
+code example:
+
+```
+#[repr(simd)]
+struct i16x8(i16, i16, i16, i16, i16, i16, i16, i16);
+
+extern "platform-intrinsic" {
+    fn x86_mm_adds_ep16(x: i16x8, y: i16x8) -> i16x8;
+    // error: unrecognized platform-specific intrinsic function
+}
+```
+
+Please verify that the function name wasn't misspelled, and ensure
+that it is declared in the rust source code (in the file
+src/librustc_platform_intrinsics/x86.rs). Example:
+
+```
+#[repr(simd)]
+struct i16x8(i16, i16, i16, i16, i16, i16, i16, i16);
+
+extern "platform-intrinsic" {
+    fn x86_mm_adds_epi16(x: i16x8, y: i16x8) -> i16x8; // ok!
+}
+```
+"##,
+
+E0442: r##"
+Intrinsic argument(s) and/or return value have the wrong type.
+Erroneous code example:
+
+```
+#[repr(simd)]
+struct i8x16(i8, i8, i8, i8, i8, i8, i8, i8,
+             i8, i8, i8, i8, i8, i8, i8, i8);
+#[repr(simd)]
+struct i32x4(i32, i32, i32, i32);
+#[repr(simd)]
+struct i64x2(i64, i64);
+
+extern "platform-intrinsic" {
+    fn x86_mm_adds_epi16(x: i8x16, y: i32x4) -> i64x2;
+    // error: intrinsic arguments/return value have wrong type
+}
+```
+
+To fix this error, please refer to the function declaration to give
+it the awaited types. Example:
+
+```
+#[repr(simd)]
+struct i16x8(i16, i16, i16, i16, i16, i16, i16, i16);
+
+extern "platform-intrinsic" {
+    fn x86_mm_adds_epi16(x: i16x8, y: i16x8) -> i16x8; // ok!
+}
+```
+"##,
+
+E0443: r##"
+Intrinsic argument(s) and/or return value have the wrong type.
+Erroneous code example:
+
+```
+#[repr(simd)]
+struct i16x8(i16, i16, i16, i16, i16, i16, i16, i16);
+#[repr(simd)]
+struct i64x8(i64, i64, i64, i64, i64, i64, i64, i64);
+
+extern "platform-intrinsic" {
+    fn x86_mm_adds_epi16(x: i16x8, y: i16x8) -> i64x8;
+    // error: intrinsic argument/return value has wrong type
+}
+```
+
+To fix this error, please refer to the function declaration to give
+it the awaited types. Example:
+
+```
+#[repr(simd)]
+struct i16x8(i16, i16, i16, i16, i16, i16, i16, i16);
+
+extern "platform-intrinsic" {
+    fn x86_mm_adds_epi16(x: i16x8, y: i16x8) -> i16x8; // ok!
+}
+```
+"##,
+
 E0444: r##"
 A platform-specific intrinsic function has wrong number of arguments.
 Erroneous code example:
@@ -3128,10 +3266,4 @@ register_diagnostics! {
     E0399, // trait items need to be implemented because the associated
            // type `{}` was overridden
     E0436,  // functional record update requires a struct
-    E0439, // invalid `simd_shuffle`, needs length: `{}`
-    E0440, // platform-specific intrinsic has wrong number of type parameters
-    E0441, // unrecognized platform-specific intrinsic function
-    E0442, // intrinsic {} has wrong type: found {}, expected {}
-    E0443, // intrinsic {} has wrong type: found `{}`, expected `{}` which
-           // was used for this vector type previously in this signature
 }