Enum FragmentError 

pub enum FragmentError {
    Parse(Vec<ParseError>),
    NoSuchStatement {
        asked: usize,
        statements: usize,
    },
    NoSuchHeredoc {
        asked: usize,
        heredocs: usize,
    },
    NeedsSessionState {
        what: String,
    },
    Eval {
        message: String,
    },
}

Why a fragment could not be expanded. Every variant names what was asked for and what was there instead — an expansion that quietly returned nothing would be read as a body that runs and produces nothing.

Variants

Parse(Vec<ParseError>)

The source did not parse.

NoSuchStatement

The program has no statement at that index.

Fields

asked: usize

statements: usize

NoSuchHeredoc

The statement has no heredoc at that index.

Fields

asked: usize

heredocs: usize

NeedsSessionState

The body reads session state the scope cannot carry — $?, $$, or a positional parameter. Expanding against an empty session would invent values.

Fields

what: String

Eval

Evaluation failed: a variable the body reads was not supplied, or a value could not become text.

Fields

message: String

Trait Implementations

impl Debug for FragmentError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for FragmentError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Error for FragmentError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.