Fix codegen test results.

codegen/src/function.rs

@@ -537,7 +537,7 @@ impl ExportedFn {
             // 2a. Property getters must take only the subject as an argument.
             FnSpecialAccess::Property(Property::Get(_)) if self.arg_count() != 1 => {
                 return Err(syn::Error::new(
-                    self.signature.span(),
+                    self.signature.inputs.span(),
                     "property getter requires exactly 1 parameter",
                 ))
             }

codegen/ui_tests/rhai_fn_getter_signature.stderr

@@ -1,5 +1,5 @@
 error: property getter requires exactly 1 parameter
-  --> $DIR/rhai_fn_getter_signature.rs:13:9
+  --> $DIR/rhai_fn_getter_signature.rs:13:20
    |
 13 |     pub fn test_fn(input: Point, value: bool) -> bool {
    |                    ^^^^^^^^^^^^^^^^^^^^^^^^^

codegen/ui_tests/rhai_fn_index_getter_signature.stderr

@@ -1,5 +1,5 @@
 error: index getter requires exactly 2 parameters
-  --> $DIR/rhai_fn_index_getter_signature.rs:13:9
+  --> $DIR/rhai_fn_index_getter_signature.rs:13:20
    |
 13 |     pub fn test_fn(input: Point) -> bool {
    |                    ^^^^^^^^^^^^

codegen/ui_tests/rhai_fn_setter_index_signature.stderr

@@ -1,5 +1,5 @@
 error: index setter requires exactly 3 parameters
-  --> $DIR/rhai_fn_setter_index_signature.rs:13:9
+  --> $DIR/rhai_fn_setter_index_signature.rs:13:20
    |
 13 |     pub fn test_fn(input: Point) -> bool {
    |                    ^^^^^^^^^^^^

codegen/ui_tests/rhai_fn_setter_return.stderr

@@ -1,5 +1,5 @@
 error: property setter cannot return any value
-  --> $DIR/rhai_fn_setter_return.rs:13:9
+  --> $DIR/rhai_fn_setter_return.rs:13:51
    |
 13 |     pub fn test_fn(input: &mut Point, value: f32) -> bool {
    |                                                   ^^^^^^^

codegen/ui_tests/rhai_fn_setter_signature.stderr

@@ -1,5 +1,5 @@
 error: property setter requires exactly 2 parameters
-  --> $DIR/rhai_fn_setter_signature.rs:13:9
+  --> $DIR/rhai_fn_setter_signature.rs:13:20
    |
 13 |     pub fn test_fn(input: Point) -> bool {
    |                    ^^^^^^^^^^^^