Fixed tuple pattern

crates/parser/src/grammar.pest

@@ -139,7 +139,7 @@ multi_pat_template = _{
 }
 
 tuple_pattern = {
-    "[" ~ multi_pat_template ~ "]"
+    "[" ~ pattern ~ "," ~ multi_pat_template ~ "]"
 }
 
 named_tuple_pattern = {

src/main.mist

@@ -102,4 +102,4 @@ void inject_mist_target(bool is_lib) {
     };
 
     fs::write("Cargo.toml", toml_content+inject).expect("Failed to inject to Cargo.toml");
-}
+}