not cache def_ident_span from disk

compiler/rustc_middle/src/query/mod.rs

@@ -1194,7 +1194,6 @@ rustc_queries! {
     /// Gets the span for the identifier of the definition.
     query def_ident_span(def_id: DefId) -> Option<Span> {
         desc { |tcx| "looking up span for `{}`'s identifier", tcx.def_path_str(def_id) }
-        cache_on_disk_if { def_id.is_local() }
         separate_provide_extern
         feedable
     }

tests/incremental/decl_macro.rs

@@ -0,0 +1,34 @@
+//@ revisions: rpass1 rpass2
+
+// issue#112680
+
+#![feature(decl_macro)]
+
+pub trait T {
+    type Key;
+    fn index_from_key(key: Self::Key) -> usize;
+}
+
+pub macro m($key_ty:ident, $val_ty:ident) {
+    struct $key_ty {
+        inner: usize,
+    }
+
+    impl T for $val_ty {
+        type Key = $key_ty;
+
+        fn index_from_key(key: Self::Key) -> usize {
+            key.inner
+        }
+    }
+}
+
+m!(TestId, Test);
+
+#[cfg(rpass1)]
+struct Test(u32);
+
+#[cfg(rpass2)]
+struct Test;
+
+fn main() {}