diff --git a/compiler/rustc_builtin_macros/src/test.rs b/compiler/rustc_builtin_macros/src/test.rs
index 6bc4f6fc1fcfc..d007c1ba18351 100644
--- a/compiler/rustc_builtin_macros/src/test.rs
+++ b/compiler/rustc_builtin_macros/src/test.rs
@@ -32,7 +32,6 @@ pub fn expand_test_case(
         return vec![];
     }
 
-    let sp = ecx.with_def_site_ctxt(attr_sp);
     let (mut item, is_stmt) = match anno_item {
         Annotatable::Item(item) => (item, false),
         Annotatable::Stmt(stmt) if let ast::StmtKind::Item(_) = stmt.kind => if let ast::StmtKind::Item(i) = stmt.into_inner().kind {
@@ -45,29 +44,41 @@ pub fn expand_test_case(
             return vec![];
         }
     };
+    let attr_sp = ecx.with_def_site_ctxt(attr_sp);
+    let sp = ecx.with_def_site_ctxt(item.span);
+
+    let test_path_symbol = Symbol::intern(&item_path(
+        // skip the name of the root module
+        &ecx.current_expansion.module.mod_path[1..],
+        &item.ident,
+    ));
+    let test_item = ecx.item(
+        sp,
+        item.ident,
+        thin_vec![ecx.attr_name_value_str(sym::rustc_test_marker, test_path_symbol, attr_sp)],
+        item.kind.clone(),
+    );
+
     item = item.map(|mut item| {
-        let test_path_symbol = Symbol::intern(&item_path(
-            // skip the name of the root module
-            &ecx.current_expansion.module.mod_path[1..],
-            &item.ident,
-        ));
         item.vis = ast::Visibility {
             span: item.vis.span,
             kind: ast::VisibilityKind::Public,
             tokens: None,
         };
-        item.ident.span = item.ident.span.with_ctxt(sp.ctxt());
-        item.attrs.push(ecx.attr_name_value_str(sym::rustc_test_marker, test_path_symbol, sp));
+        item.ident.span = item.ident.span.with_ctxt(attr_sp.ctxt());
         item
     });
 
     let ret = if is_stmt {
-        Annotatable::Stmt(P(ecx.stmt_item(item.span, item)))
+        vec![
+            Annotatable::Stmt(P(ecx.stmt_item(test_item.span, test_item))),
+            Annotatable::Stmt(P(ecx.stmt_item(item.span, item))),
+        ]
     } else {
-        Annotatable::Item(item)
+        vec![Annotatable::Item(test_item), Annotatable::Item(item)]
     };
 
-    vec![ret]
+    ret
 }
 
 pub fn expand_test(
diff --git a/tests/ui/custom_test_frameworks/auxiliary/issue-100263-macro.rs b/tests/ui/custom_test_frameworks/auxiliary/issue-100263-macro.rs
new file mode 100644
index 0000000000000..2d4abbe8f1124
--- /dev/null
+++ b/tests/ui/custom_test_frameworks/auxiliary/issue-100263-macro.rs
@@ -0,0 +1,12 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+use proc_macro::TokenStream;
+
+#[proc_macro_attribute]
+pub fn test(_args: TokenStream, _item: TokenStream) -> TokenStream {
+    TokenStream::default()
+}
diff --git a/tests/ui/custom_test_frameworks/issue-100263.rs b/tests/ui/custom_test_frameworks/issue-100263.rs
new file mode 100644
index 0000000000000..63a7e53907d3c
--- /dev/null
+++ b/tests/ui/custom_test_frameworks/issue-100263.rs
@@ -0,0 +1,12 @@
+// compile-flags: --test
+// aux-build: issue-100263-macro.rs
+#![feature(custom_test_frameworks)]
+
+extern crate issue_100263_macro;
+
+#[test_case]
+#[issue_100263_macro::test]
+fn foo() {}
+//~^ ERROR mismatched types
+
+fn main() {}
diff --git a/tests/ui/custom_test_frameworks/issue-100263.stderr b/tests/ui/custom_test_frameworks/issue-100263.stderr
new file mode 100644
index 0000000000000..67d9d9716a308
--- /dev/null
+++ b/tests/ui/custom_test_frameworks/issue-100263.stderr
@@ -0,0 +1,16 @@
+error[E0308]: mismatched types
+  --> $DIR/issue-100263.rs:9:1
+   |
+LL | #[test_case]
+   | ------------ in this procedural macro expansion
+LL | #[issue_100263_macro::test]
+LL | fn foo() {}
+   | ^^^^^^^^^^^ expected `&TestDescAndFn`, found `&fn() {foo}`
+   |
+   = note: expected reference `&TestDescAndFn`
+              found reference `&fn() {foo}`
+   = note: this error originates in the attribute macro `test_case` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0308`.