tweak Const::identity_unevaluated name and docs

Author: RalfJung

compiler/rustc_middle/src/mir/consts.rs

@@ -221,7 +221,9 @@ pub enum Const<'tcx> {
 }
 
 impl<'tcx> Const<'tcx> {
-    pub fn identity_unevaluated(
+    /// Creates an unevaluated const from a `DefId` for a const item.
+    /// The binders of the const item still need to be instantiated.
+    pub fn from_unevaluated(
         tcx: TyCtxt<'tcx>,
         def_id: DefId,
     ) -> ty::EarlyBinder<'tcx, Const<'tcx>> {

compiler/rustc_mir_build/src/thir/cx/expr.rs

@@ -699,21 +699,17 @@ impl<'tcx> Cx<'tcx> {
                             }
                         }
                         hir::InlineAsmOperand::Const { ref anon_const } => {
-                            let value = mir::Const::identity_unevaluated(
-                                tcx,
-                                anon_const.def_id.to_def_id(),
-                            )
-                            .instantiate_identity();
+                            let value =
+                                mir::Const::from_unevaluated(tcx, anon_const.def_id.to_def_id())
+                                    .instantiate_identity();
                             let span = tcx.def_span(anon_const.def_id);
 
                             InlineAsmOperand::Const { value, span }
                         }
                         hir::InlineAsmOperand::SymFn { ref anon_const } => {
-                            let value = mir::Const::identity_unevaluated(
-                                tcx,
-                                anon_const.def_id.to_def_id(),
-                            )
-                            .instantiate_identity();
+                            let value =
+                                mir::Const::from_unevaluated(tcx, anon_const.def_id.to_def_id())
+                                    .instantiate_identity();
                             let span = tcx.def_span(anon_const.def_id);
 
                             InlineAsmOperand::SymFn { value, span }