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Use "(associated) function" terminology instead of "method".

Co-authored-by: Daniel Henry-Mantilla <daniel.henry.mantilla@gmail.com>

compiler/rustc_feature/src/builtin_attrs.rs

@@ -678,7 +678,7 @@ pub const BUILTIN_ATTRIBUTES: &[BuiltinAttribute] = &[
         from method dispatch when the receiver is an array, for compatibility in editions < 2021."
     ),
     rustc_attr!(
-        rustc_must_implement_one_of, Normal, template!(List: "method1, method2, ..."), ErrorFollowing,
+        rustc_must_implement_one_of, Normal, template!(List: "function1, function2, ..."), ErrorFollowing,
         "the `#[rustc_must_implement_one_of]` attribute is used to change minimal complete \
         definition of a trait, it's currently in experimental form and should be changed before \
         being exposed outside of the std"

compiler/rustc_middle/src/ty/trait_def.rs

@@ -45,7 +45,7 @@ pub struct TraitDef {
     /// recomputed all the time.
     pub def_path_hash: DefPathHash,
 
-    /// List of methods from `#[rustc_must_implement_one_of]` attribute one of which
+    /// List of functions from `#[rustc_must_implement_one_of]` attribute one of which
     /// must be implemented.
     pub must_implement_one_of: Option<Box<[Ident]>>,
 }

compiler/rustc_typeck/src/collect.rs

@@ -1253,15 +1253,17 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: DefId) -> ty::TraitDef {
                 .map(|item| item.ident().ok_or(item.span()))
                 .collect::<Result<Box<[_]>, _>>()
                 .map_err(|span| {
-                    tcx.sess.struct_span_err(span, "must be an identifier of a method").emit();
+                    tcx.sess
+                        .struct_span_err(span, "must be a name of an associated function")
+                        .emit();
                 })
                 .ok()
                 .zip(Some(attr.span)),
             // Error is reported by `rustc_attr!`
             None => None,
         })
         // Check that all arguments of `#[rustc_must_implement_one_of]` reference
-        // methods in the trait with default implementations
+        // functions in the trait with default implementations
         .and_then(|(list, attr_span)| {
             let errors = list.iter().filter_map(|ident| {
                 let item = items.iter().find(|item| item.ident == *ident);
@@ -1272,7 +1274,7 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: DefId) -> ty::TraitDef {
                             tcx.sess
                                 .struct_span_err(
                                     item.span,
-                                    "This method doesn't have a default implementation",
+                                    "This function doesn't have a default implementation",
                                 )
                                 .span_note(attr_span, "required by this annotation")
                                 .emit();
@@ -1284,16 +1286,16 @@ fn trait_def(tcx: TyCtxt<'_>, def_id: DefId) -> ty::TraitDef {
                     }
                     Some(item) => tcx
                         .sess
-                        .struct_span_err(item.span, "Not a method")
+                        .struct_span_err(item.span, "Not a function")
                         .span_note(attr_span, "required by this annotation")
                         .note(
                             "All `#[rustc_must_implement_one_of]` arguments \
-                            must be method identifiers",
+                            must be associated function names",
                         )
                         .emit(),
                     None => tcx
                         .sess
-                        .struct_span_err(ident.span, "Method not found in this trait")
+                        .struct_span_err(ident.span, "Function not found in this trait")
                         .emit(),
                 }
 

src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.rs

@@ -1,12 +1,12 @@
 #![feature(rustc_attrs)]
 
 #[rustc_must_implement_one_of(a, b)]
-//~^ Method not found in this trait
-//~| Method not found in this trait
+//~^ Function not found in this trait
+//~| Function not found in this trait
 trait Tr0 {}
 
 #[rustc_must_implement_one_of(a, b)]
-//~^ Method not found in this trait
+//~^ Function not found in this trait
 trait Tr1 {
     fn a() {}
 }
@@ -23,16 +23,16 @@ trait Tr3 {}
 
 #[rustc_must_implement_one_of(A, B)]
 trait Tr4 {
-    const A: u8 = 1; //~ Not a method
+    const A: u8 = 1; //~ Not a function
 
-    type B; //~ Not a method
+    type B; //~ Not a function
 }
 
 #[rustc_must_implement_one_of(a, b)]
 trait Tr5 {
-    fn a(); //~ This method doesn't have a default implementation
+    fn a(); //~ This function doesn't have a default implementation
 
-    fn b(); //~ This method doesn't have a default implementation
+    fn b(); //~ This function doesn't have a default implementation
 }
 
 fn main() {}

src/test/ui/traits/default-method/rustc_must_implement_one_of_misuse.stderr

@@ -2,21 +2,21 @@ error: malformed `rustc_must_implement_one_of` attribute input
   --> $DIR/rustc_must_implement_one_of_misuse.rs:20:1
    |
 LL | #[rustc_must_implement_one_of]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_must_implement_one_of(method1, method2, ...)]`
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: must be of the form: `#[rustc_must_implement_one_of(function1, function2, ...)]`
 
-error: Method not found in this trait
+error: Function not found in this trait
   --> $DIR/rustc_must_implement_one_of_misuse.rs:3:31
    |
 LL | #[rustc_must_implement_one_of(a, b)]
    |                               ^
 
-error: Method not found in this trait
+error: Function not found in this trait
   --> $DIR/rustc_must_implement_one_of_misuse.rs:3:34
    |
 LL | #[rustc_must_implement_one_of(a, b)]
    |                                  ^
 
-error: Method not found in this trait
+error: Function not found in this trait
   --> $DIR/rustc_must_implement_one_of_misuse.rs:8:34
    |
 LL | #[rustc_must_implement_one_of(a, b)]
@@ -28,7 +28,7 @@ error: the `#[rustc_must_implement_one_of]` attribute must be used with at least
 LL | #[rustc_must_implement_one_of(a)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: Not a method
+error: Not a function
   --> $DIR/rustc_must_implement_one_of_misuse.rs:26:5
    |
 LL |     const A: u8 = 1;
@@ -39,9 +39,9 @@ note: required by this annotation
    |
 LL | #[rustc_must_implement_one_of(A, B)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: All `#[rustc_must_implement_one_of]` arguments must be method identifiers
+   = note: All `#[rustc_must_implement_one_of]` arguments must be associated function names
 
-error: Not a method
+error: Not a function
   --> $DIR/rustc_must_implement_one_of_misuse.rs:28:5
    |
 LL |     type B;
@@ -52,9 +52,9 @@ note: required by this annotation
    |
 LL | #[rustc_must_implement_one_of(A, B)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-   = note: All `#[rustc_must_implement_one_of]` arguments must be method identifiers
+   = note: All `#[rustc_must_implement_one_of]` arguments must be associated function names
 
-error: This method doesn't have a default implementation
+error: This function doesn't have a default implementation
   --> $DIR/rustc_must_implement_one_of_misuse.rs:33:5
    |
 LL |     fn a();
@@ -66,7 +66,7 @@ note: required by this annotation
 LL | #[rustc_must_implement_one_of(a, b)]
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-error: This method doesn't have a default implementation
+error: This function doesn't have a default implementation
   --> $DIR/rustc_must_implement_one_of_misuse.rs:35:5
    |
 LL |     fn b();