Remove unused descr methods

compiler/rustc_hir/src/hir.rs

@@ -3141,15 +3141,6 @@ pub enum TraitItemKind<'hir> {
     /// type.
     Type(GenericBounds<'hir>, Option<&'hir Ty<'hir>>),
 }
-impl TraitItemKind<'_> {
-    pub fn descr(&self) -> &'static str {
-        match self {
-            TraitItemKind::Const(..) => "associated constant",
-            TraitItemKind::Fn(..) => "function",
-            TraitItemKind::Type(..) => "associated type",
-        }
-    }
-}
 
 // The bodies for items are stored "out of line", in a separate
 // hashmap in the `Crate`. Here we just record the hir-id of the item
@@ -3211,15 +3202,6 @@ pub enum ImplItemKind<'hir> {
     /// An associated type.
     Type(&'hir Ty<'hir>),
 }
-impl ImplItemKind<'_> {
-    pub fn descr(&self) -> &'static str {
-        match self {
-            ImplItemKind::Const(..) => "associated constant",
-            ImplItemKind::Fn(..) => "function",
-            ImplItemKind::Type(..) => "associated type",
-        }
-    }
-}
 
 /// A constraint on an associated item.
 ///
@@ -4545,16 +4527,6 @@ pub enum ForeignItemKind<'hir> {
     Type,
 }
 
-impl ForeignItemKind<'_> {
-    pub fn descr(&self) -> &'static str {
-        match self {
-            ForeignItemKind::Fn(..) => "function",
-            ForeignItemKind::Static(..) => "static variable",
-            ForeignItemKind::Type => "type",
-        }
-    }
-}
-
 /// A variable captured by a closure.
 #[derive(Debug, Copy, Clone, HashStable_Generic)]
 pub struct Upvar {

tests/ui/did_you_mean/replace-impl-infer-ty-from-trait.fixed

@@ -7,7 +7,7 @@ trait Foo<T>: Sized {
 
 impl Foo<usize> for () {
     fn bar(i: i32, t: usize, s: &()) -> (usize, i32) {
-        //~^ ERROR the placeholder `_` is not allowed within types on item signatures for functions
+        //~^ ERROR the placeholder `_` is not allowed within types on item signatures for associated functions
         //~| ERROR type annotations needed
         (1, 2)
     }