Remove Span from hir::ConstArg.

Author: cjgillot

compiler/rustc_ast_lowering/src/lib.rs

@@ -1312,16 +1312,15 @@ impl<'a, 'hir> LoweringContext<'a, 'hir> {
                                 id: node_id,
                                 value: rustc_ast::ptr::P(path_expr),
                             });
-                            return GenericArg::Const(ConstArg { value: ct, span: ty.span });
+                            return GenericArg::Const(ConstArg { value: ct });
                         }
                     }
                 }
                 GenericArg::Type(self.lower_ty_direct(&ty, itctx))
             }
-            ast::GenericArg::Const(ct) => GenericArg::Const(ConstArg {
-                value: self.lower_anon_const(&ct),
-                span: ct.value.span,
-            }),
+            ast::GenericArg::Const(ct) => {
+                GenericArg::Const(ConstArg { value: self.lower_anon_const(&ct) })
+            }
         }
     }
 

compiler/rustc_hir/src/hir.rs

@@ -250,7 +250,6 @@ impl<'hir> PathSegment<'hir> {
 #[derive(Encodable, Debug, HashStable_Generic)]
 pub struct ConstArg {
     pub value: AnonConst,
-    pub span: Span,
 }
 
 #[derive(Debug, HashStable_Generic)]

compiler/rustc_typeck/src/astconv/mod.rs

@@ -1877,7 +1877,7 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
                         }
                         err_for_ct = true;
                         has_err = true;
-                        (ct.span, "const")
+                        (self.tcx().hir().span(ct.value.hir_id), "const")
                     }
                 };
                 let mut err = struct_span_err!(