Add new acceptance test scenario (012)
```
Error:
× Main thread panicked.
├─▶ at crates/lang/src/uplc.rs:3413:34
╰─▶ internal error: entered unreachable code: Var {
scope: [
0,
1,
3,
24,
25,
29,
32,
],
constructor: ValueConstructor {
public: false,
variant: LocalVariable {
location: 46..62,
},
tipo: Fn {
args: [
Var {
tipo: RefCell {
value: Link {
tipo: App {
public: true,
module: "",
name: "Int",
args: [],
},
},
},
},
],
ret: App {
public: true,
module: "",
name: "Bool",
args: [],
},
},
},
name: "f",
variant_name: "",
}
```