Don't require comma in inner(rule(..),)

derive/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pest-ast"
-version = "0.3.2"
+version = "0.3.3"
 authors = ["cad97 <[email protected]>"]
 description = "Derive to convert from pest parse tree to typed syntax tree"
 license = "MIT"

derive/src/attributes.rs

@@ -217,7 +217,7 @@ impl Parse for InnerAttribute {
         let inner = input.parse()?;
         let paren = parenthesized!(content in input);
         let (rule, comma) = if content.peek(kw::rule) {
-            (Some(content.parse()?), Some(content.parse()?))
+            (Some(content.parse()?), content.parse().ok().and_then(Some))
         } else {
             (None, None)
         };