Format exported variadic parameters correctly (#1451)

src/parameter.rs

@@ -15,12 +15,12 @@ pub(crate) struct Parameter<'src> {
 
 impl<'src> ColorDisplay for Parameter<'src> {
   fn fmt(&self, f: &mut Formatter, color: Color) -> Result<(), fmt::Error> {
-    if self.export {
-      write!(f, "$")?;
-    }
     if let Some(prefix) = self.kind.prefix() {
       write!(f, "{}", color.annotation().paint(prefix))?;
     }
+    if self.export {
+      write!(f, "$")?;
+    }
     write!(f, "{}", color.parameter().paint(self.name.lexeme()))?;
     if let Some(ref default) = self.default {
       write!(f, "={}", color.string().paint(&default.to_string()))?;

tests/fmt.rs

@@ -1042,3 +1042,12 @@ test! {
         echo foo
   ",
 }
+
+#[test]
+fn exported_parameter() {
+  Test::new()
+    .justfile("foo +$f:")
+    .args(&["--dump"])
+    .stdout("foo +$f:\n")
+    .run();
+}