Allow specifying alignment for functions

src/test/codegen/align-fn.rs

@@ -0,0 +1,9 @@
+// compile-flags: -C no-prepopulate-passes -Z mir-opt-level=0
+
+#![crate_type = "lib"]
+#![feature(fn_align)]
+
+// CHECK: align 16
+#[no_mangle]
+#[repr(align(16))]
+pub fn fn_align() {}

src/test/ui/attributes/nonterminal-expansion.rs

@@ -3,7 +3,6 @@
 macro_rules! pass_nonterminal {
     ($n:expr) => {
         #[repr(align($n))] //~ ERROR expected unsuffixed literal or identifier, found `n!()`
-                           //~| ERROR unrecognized representation hint
         struct S;
     };
 }

src/test/ui/attributes/nonterminal-expansion.stderr

@@ -9,17 +9,5 @@ LL | pass_nonterminal!(n!());
    |
    = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
 
-error[E0552]: unrecognized representation hint
-  --> $DIR/nonterminal-expansion.rs:5:16
-   |
-LL |         #[repr(align($n))]
-   |                ^^^^^^^^^
-...
-LL | pass_nonterminal!(n!());
-   | ------------------------ in this macro invocation
-   |
-   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)
+error: aborting due to previous error
 
-error: aborting due to 2 previous errors
-
-For more information about this error, try `rustc --explain E0552`.

src/test/ui/error-codes/E0565.rs

@@ -1,6 +1,5 @@
 // repr currently doesn't support literals
 #[repr("C")] //~ ERROR E0565
-             //~| ERROR E0565
-struct A {  }
+struct A {}
 
-fn main() {  }
+fn main() {}

src/test/ui/error-codes/E0565.stderr

@@ -4,12 +4,6 @@ error[E0565]: meta item in `repr` must be an identifier
 LL | #[repr("C")]
    |        ^^^
 
-error[E0565]: meta item in `repr` must be an identifier
-  --> $DIR/E0565.rs:2:8
-   |
-LL | #[repr("C")]
-   |        ^^^
-
-error: aborting due to 2 previous errors
+error: aborting due to previous error
 
 For more information about this error, try `rustc --explain E0565`.

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

@@ -0,0 +1,4 @@
+#![crate_type = "lib"]
+
+#[repr(align(16))] //~ ERROR `repr(align)` attributes on functions are unstable
+fn requires_alignment() {}

src/test/ui/feature-gates/feature-gate-fn_align.stderr

@@ -0,0 +1,12 @@
+error[E0658]: `repr(align)` attributes on functions are unstable
+  --> $DIR/feature-gate-fn_align.rs:3:8
+   |
+LL | #[repr(align(16))]
+   |        ^^^^^^^^^
+   |
+   = note: see issue #82232 <https://github.com/rust-lang/rust/issues/82232> for more information
+   = help: add `#![feature(fn_align)]` to the crate attributes to enable
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0658`.

src/test/ui/issues/issue-43988.rs

@@ -13,13 +13,13 @@ fn main() {
 
     #[repr(nothing)]
     let _x = 0;
-    //~^^ ERROR attribute should be applied to a struct, enum, or union
+    //~^^ ERROR E0552
 
     #[repr(something_not_real)]
     loop {
         ()
     };
-    //~^^^^ ERROR attribute should be applied to a struct, enum, or union
+    //~^^^^ ERROR E0552
 
     #[repr]
     let _y = "123";

src/test/ui/issues/issue-43988.stderr

@@ -26,23 +26,17 @@ LL |     #[inline(XYZ)]
 LL |     let _b = 4;
    |     ----------- not a function or closure
 
-error[E0517]: attribute should be applied to a struct, enum, or union
+error[E0552]: unrecognized representation hint
   --> $DIR/issue-43988.rs:14:12
    |
 LL |     #[repr(nothing)]
    |            ^^^^^^^
-LL |     let _x = 0;
-   |     ----------- not a struct, enum, or union
 
-error[E0517]: attribute should be applied to a struct, enum, or union
+error[E0552]: unrecognized representation hint
   --> $DIR/issue-43988.rs:18:12
    |
-LL |       #[repr(something_not_real)]
-   |              ^^^^^^^^^^^^^^^^^^
-LL | /     loop {
-LL | |         ()
-LL | |     };
-   | |_____- not a struct, enum, or union
+LL |     #[repr(something_not_real)]
+   |            ^^^^^^^^^^^^^^^^^^
 
 error[E0518]: attribute should be applied to function or closure
   --> $DIR/issue-43988.rs:30:5
@@ -54,5 +48,5 @@ LL |     foo();
 
 error: aborting due to 7 previous errors
 
-Some errors have detailed explanations: E0517, E0518.
-For more information about an error, try `rustc --explain E0517`.
+Some errors have detailed explanations: E0518, E0552.
+For more information about an error, try `rustc --explain E0518`.

src/test/ui/repr/repr-disallow-on-variant.rs

@@ -2,7 +2,7 @@ struct Test;
 
 enum Foo {
     #[repr(u8)]
-    //~^ ERROR attribute should be applied to a struct, enum, or union
+    //~^ ERROR attribute should be applied to an enum
     Variant,
 }
 

src/test/ui/repr/repr-disallow-on-variant.stderr

@@ -1,11 +1,11 @@
-error[E0517]: attribute should be applied to a struct, enum, or union
+error[E0517]: attribute should be applied to an enum
   --> $DIR/repr-disallow-on-variant.rs:4:12
    |
 LL |     #[repr(u8)]
    |            ^^
 LL |
 LL |     Variant,
-   |     ------- not a struct, enum, or union
+   |     ------- not an enum
 
 error: aborting due to previous error