Typo in consts.rs

Author: Jaic1

compiler/rustc_middle/src/ty/consts.rs

@@ -306,7 +306,7 @@ impl<'tcx> Const<'tcx> {
             match tcx.at(expr.span).lit_to_const(lit_input) {
                 Ok(c) => return Some(c),
                 Err(_) if lit_input.ty.has_aliases() => {
-                    // allow the `ty`` to be an alias type, though we cannot handle it here
+                    // allow the `ty` to be an alias type, though we cannot handle it here
                     return None
                 },
                 Err(e) => {