Remove MetaItemParser::{path,deconstruct}.

They're equivalent, and `path` is unused, and `deconstruct` has only one
call site outside of `path`.

compiler/rustc_attr_parsing/src/context.rs

@@ -260,7 +260,8 @@ impl<'sess> AttributeParser<'sess> {
                 // }
                 ast::AttrKind::Normal(n) => {
                     let parser = MetaItemParser::from_attr(n, self.dcx());
-                    let (path, args) = parser.deconstruct();
+                    let path = parser.path_without_args();
+                    let args = parser.args();
                     let parts = path.segments().map(|i| i.name).collect::<Vec<_>>();
 
                     if let Some(accepts) = ATTRIBUTE_MAPPING.0.get(parts.as_slice()) {

compiler/rustc_attr_parsing/src/parser.rs

@@ -253,7 +253,11 @@ impl<'a> MetaItemParser<'a> {
         }
     }
 
-    /// Gets just the path, without the args.
+    /// Gets just the path, without the args. Some examples:
+    ///
+    /// - `#[rustfmt::skip]`: `rustfmt::skip` is a path
+    /// - `#[allow(clippy::complexity)]`: `clippy::complexity` is a path
+    /// - `#[inline]`: `inline` is a single segment path
     pub fn path_without_args(&self) -> PathParser<'a> {
         self.path.clone()
     }
@@ -263,19 +267,6 @@ impl<'a> MetaItemParser<'a> {
         &self.args
     }
 
-    pub fn deconstruct(&self) -> (PathParser<'a>, &ArgParser<'a>) {
-        (self.path_without_args(), self.args())
-    }
-
-    /// Asserts that this MetaItem starts with a path. Some examples:
-    ///
-    /// - `#[rustfmt::skip]`: `rustfmt::skip` is a path
-    /// - `#[allow(clippy::complexity)]`: `clippy::complexity` is a path
-    /// - `#[inline]`: `inline` is a single segment path
-    pub fn path(&self) -> (PathParser<'a>, &ArgParser<'a>) {
-        self.deconstruct()
-    }
-
     /// Asserts that this MetaItem starts with a word, or single segment path.
     ///
     /// Some examples: