EnvParseError::FieldFoo(ref err) => { write!(f, "Failed to parse environment variable 'TEST_APP_FOO': {}.\n\nHint: the value must be ", err)?; ::describe_type(&mut *f)?; write!(f, ".") }, EnvParseError::FieldBar(ref err) => { write!(f, "Failed to parse environment variable 'TEST_APP_BAR': {}.\n\nHint: the value must be ", err)?; ::describe_type(&mut *f)?; write!(f, ".") }, EnvParseError::FieldBaz(ref err) => { write!(f, "Failed to parse environment variable 'TEST_APP_BAZ': {}.\n\nHint: the value must be ", err)?; ::describe_type(&mut *f)?; write!(f, ".") }, EnvParseError::FieldVerbose(ref err) => { write!(f, "Invalid value '{:?}' for 'TEST_APP_VERBOSE'.\n\nHint: the allowed values are 0, false, 1, true.", err) }, EnvParseError::FieldFast(ref err) => { write!(f, "Invalid value '{:?}' for 'TEST_APP_FAST'.\n\nHint: the allowed values are 0, false, 1, true.", err) },