Remove hir::Param::attrs.

Author: cjgillot

compiler/rustc_ast_lowering/src/expr.rs

@@ -663,7 +663,7 @@ impl<'hir> LoweringContext<'_, 'hir> {
             Ident::with_dummy_span(sym::_task_context),
             hir::BindingAnnotation::Mutable,
         );
-        let param = hir::Param { attrs: &[], hir_id: self.next_id(), pat, ty_span: span, span };
+        let param = hir::Param { hir_id: self.next_id(), pat, ty_span: span, span };
         let params = arena_vec![self; param];
 
         let body_id = self.lower_body(move |this| {

compiler/rustc_ast_lowering/src/item.rs

@@ -1042,9 +1042,9 @@ impl<'hir> LoweringContext<'_, 'hir> {
 
     fn lower_param(&mut self, param: &Param) -> hir::Param<'hir> {
         let hir_id = self.lower_node_id(param.id);
+        self.lower_attrs(hir_id, &param.attrs);
         hir::Param {
             hir_id,
-            attrs: self.lower_attrs(hir_id, &param.attrs),
             pat: self.lower_pat(&param.pat),
             ty_span: param.ty.span,
             span: param.span,
@@ -1179,7 +1179,6 @@ impl<'hir> LoweringContext<'_, 'hir> {
                 let stmt_attrs = this.attrs[parameter.hir_id];
                 let (new_parameter_pat, new_parameter_id) = this.pat_ident(desugared_span, ident);
                 let new_parameter = hir::Param {
-                    attrs: parameter.attrs,
                     hir_id: parameter.hir_id,
                     pat: new_parameter_pat,
                     ty_span: parameter.ty_span,

compiler/rustc_hir/src/hir.rs

@@ -2421,7 +2421,6 @@ pub struct LlvmInlineAsm<'hir> {
 /// Represents a parameter in a function header.
 #[derive(Debug, HashStable_Generic)]
 pub struct Param<'hir> {
-    pub attrs: &'hir [Attribute],
     pub hir_id: HirId,
     pub pat: &'hir Pat<'hir>,
     pub ty_span: Span,

compiler/rustc_hir_pretty/src/lib.rs

@@ -2032,7 +2032,7 @@ impl<'a> State<'a> {
     }
 
     pub fn print_param(&mut self, arg: &hir::Param<'_>) {
-        self.print_outer_attributes(&arg.attrs);
+        self.print_outer_attributes(self.attrs(arg.hir_id));
         self.print_pat(&arg.pat);
     }