compilation_unit {
  package_statement {
    package_name: "ExplorerTest"
  }
  is_api: true
  declarations {
    function {
      name {
        name: "Foo"
      }
      param_pattern {
      }
      return_term {
        kind: Expression
        type {
          tuple_literal {
          }
        }
      }
      body {
        statements {
          variable_definition {
            pattern {
              binding_pattern {
                name: "x"
                type {
                  expression_pattern {
                    expression {
                      tuple_literal {
                      }
                    }
                  }
                }
              }
            }
            init {
              tuple_literal {
              }
            }
            is_returned: true
          }
        }
        statements {
          return_var_statement {
          }
        }
      }
    }
  }
  declarations {
    function {
      name {
        name: "Main"
      }
      param_pattern {
      }
      return_term {
        kind: Expression
        type {
          int_type_literal {
          }
        }
      }
      body {
        statements {
          expression_statement {
            expression {
              call {
                function {
                  identifier {
                    name: "Foo"
                  }
                }
                argument {
                  tuple_literal {
                  }
                }
              }
            }
          }
        }
        statements {
          return_expression_statement {
            expression {
              int_literal {
                value: 0
              }
            }
          }
        }
      }
    }
  }
}