conlang: Add Tuple-Struct Patterns

- Patterns are no longer parsed with the highest precedence
- Function calls with just a path and a tuple of args can now be transformed into a Pattern

compiler/cl-repl/examples/yaml.rs

@@ -438,13 +438,20 @@ pub mod yamlify {
                 Pattern::Struct(path, items) => {
                     {
                         let mut y = y.key("Struct");
-                        y.pair("name", path);
+                        y.yaml(path);
                         for (name, item) in items {
                             y.pair(name, item);
                         }
                     }
                     y
                 }
+                Pattern::TupleStruct(path, items) => {
+                    {
+                        let mut y = y.key("TupleStruct");
+                        y.yaml(path).list(items);
+                    }
+                    y
+                }
             };
         }
     }