diff --git a/compiler/rustc_session/src/config.rs b/compiler/rustc_session/src/config.rs
index d29ab02c1a6..e120f595d92 100644
--- a/compiler/rustc_session/src/config.rs
+++ b/compiler/rustc_session/src/config.rs
@@ -813,7 +813,6 @@ pub fn opt_path(&self) -> Option<&Path> {
                 FileName::Anon(_) => None,
                 FileName::MacroExpansion(_) => None,
                 FileName::ProcMacroSourceCode(_) => None,
-                FileName::CfgSpec(_) => None,
                 FileName::CliCrateAttr(_) => None,
                 FileName::Custom(_) => None,
                 FileName::DocTest(path, _) => Some(path),
diff --git a/compiler/rustc_span/src/lib.rs b/compiler/rustc_span/src/lib.rs
index 772e09291a1..6a7bca73e7c 100644
--- a/compiler/rustc_span/src/lib.rs
+++ b/compiler/rustc_span/src/lib.rs
@@ -280,8 +280,7 @@ pub fn to_string_lossy(&self, display_pref: FileNameDisplayPreference) -> Cow<'_
 }
 
 /// Differentiates between real files and common virtual files.
-#[derive(Debug, Eq, PartialEq, Clone, Ord, PartialOrd, Hash)]
-#[derive(Decodable, Encodable)]
+#[derive(Debug, Eq, PartialEq, Clone, Ord, PartialOrd, Hash, Decodable, Encodable)]
 pub enum FileName {
     Real(RealFileName),
     /// Call to `quote!`.
@@ -292,8 +291,6 @@ pub enum FileName {
     // FIXME(jseyfried)
     MacroExpansion(Hash64),
     ProcMacroSourceCode(Hash64),
-    /// Strings provided as `--cfg [cfgspec]` stored in a `crate_cfg`.
-    CfgSpec(Hash64),
     /// Strings provided as crate attributes in the CLI.
     CliCrateAttr(Hash64),
     /// Custom sources for explicit parser calls from plugins and drivers.
@@ -339,7 +336,6 @@ fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
             MacroExpansion(_) => write!(fmt, "<macro expansion>"),
             Anon(_) => write!(fmt, "<anon>"),
             ProcMacroSourceCode(_) => write!(fmt, "<proc-macro source code>"),
-            CfgSpec(_) => write!(fmt, "<cfgspec>"),
             CliCrateAttr(_) => write!(fmt, "<crate attribute>"),
             Custom(ref s) => write!(fmt, "<{s}>"),
             DocTest(ref path, _) => write!(fmt, "{}", path.display()),
@@ -365,7 +361,6 @@ pub fn is_real(&self) -> bool {
             Anon(_)
             | MacroExpansion(_)
             | ProcMacroSourceCode(_)
-            | CfgSpec(_)
             | CliCrateAttr(_)
             | Custom(_)
             | QuoteExpansion(_)