3 files changed, 5 insertions, 2 deletions
diff --git a/src/librustc_span/def_id.rs b/src/librustc_span/def_id.rs
index a2944782e91..af8d5ce09b5 100644
--- a/src/librustc_span/def_id.rs
+++ b/src/librustc_span/def_id.rs
@@ -25,7 +25,7 @@ pub enum CrateNum {
 
 /// Item definitions in the currently-compiled crate would have the `CrateNum`
 /// `LOCAL_CRATE` in their `DefId`.
-pub const LOCAL_CRATE: CrateNum = CrateNum::Index(CrateId::from_u32_const(0));
+pub const LOCAL_CRATE: CrateNum = CrateNum::Index(CrateId::from_u32(0));
 
 impl Idx for CrateNum {
     #[inline]
diff --git a/src/librustc_span/lib.rs b/src/librustc_span/lib.rs
index caa50e9a41c..1f6d10f4e8f 100644
--- a/src/librustc_span/lib.rs
+++ b/src/librustc_span/lib.rs
@@ -6,6 +6,9 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/")]
 #![feature(crate_visibility_modifier)]
+#![feature(const_if_match)]
+#![feature(const_fn)]
+#![feature(const_panic)]
 #![feature(nll)]
 #![feature(optin_builtin_traits)]
 #![feature(specialization)]
diff --git a/src/librustc_span/symbol.rs b/src/librustc_span/symbol.rs
index 19754c83038..5685505f694 100644
--- a/src/librustc_span/symbol.rs
+++ b/src/librustc_span/symbol.rs
@@ -1026,7 +1026,7 @@ rustc_index::newtype_index! {
 
 impl Symbol {
     const fn new(n: u32) -> Self {
-        Symbol(SymbolIndex::from_u32_const(n))
+        Symbol(SymbolIndex::from_u32(n))
     }
 
     /// Maps a string to its interned representation.