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-interpret/src/interpret.rs

@@ -320,6 +320,9 @@ mod assignment {
                         None => set.push(name),
                     });
                 }
+                Pattern::TupleStruct(_path, items) => {
+                    items.iter().for_each(|pat| patvars(set, pat));
+                }
             }
         }
         let mut set = Vec::new();