DSL EXPRESSION:
func f(){}


AST:
"block" [tt:block] [nt:StatementBlock]
    "f" [tt:non_sigil_name] [nt:NamedFunctionDefinition]
        "params" [tt:params] [nt:ParameterList]
        "block" [tt:block] [nt:StatementBlockInBraces]
            "block" [tt:block] [nt:StatementBlock]

