diff options
Diffstat (limited to 'src/rustc/middle')
| -rw-r--r-- | src/rustc/middle/lint.rs | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/rustc/middle/lint.rs b/src/rustc/middle/lint.rs index ebdc66156e3..0f31f2056a1 100644 --- a/src/rustc/middle/lint.rs +++ b/src/rustc/middle/lint.rs @@ -683,8 +683,12 @@ fn check_fn_deprecated_modes(tcx: ty::ctxt, fn_ty: ty::t, decl: ast::fn_decl, mode_to_str(arg_ast.mode)); match arg_ast.mode { ast::expl(ast::by_copy) => { - // This should warn, but we can't yet - // since it's still used. -- tjc + if !tcx.legacy_modes { + tcx.sess.span_lint( + deprecated_mode, id, id, span, + fmt!("argument %d uses by-copy mode", + counter)); + } } ast::expl(_) => { |