Fix ui tests in nightly

.vscode/settings.json

@@ -1,4 +1,5 @@
 {
   "rust-analyzer.check.command": "clippy",
-  "rust-analyzer.cargo.features": "all"
+  "rust-analyzer.cargo.features": "all",
+  "rust-analyzer.testExplorer": true
 }

schemars/tests/ui/repr_non_unit_variant.stderr

@@ -2,4 +2,4 @@ error: JsonSchema_repr: must be a unit variant
  --> $DIR/repr_non_unit_variant.rs:7:5
   |
 7 |     EmptyTuple(),
-  |     ^^^^^^^^^^
+  |     ^^^^^^^^^^^^

schemars_derive/src/schema_exprs.rs

@@ -81,8 +81,8 @@ pub fn expr_for_repr(cont: &Container) -> Result<SchemaExpr, syn::Error> {
 
     if let Some(non_unit_error) = variants.iter().find_map(|v| match v.style {
         Style::Unit => None,
-        _ => Some(syn::Error::new(
-            v.original.span(),
+        _ => Some(syn::Error::new_spanned(
+            v.original,
             "JsonSchema_repr: must be a unit variant",
         )),
     }) {