Enum Error 

pub enum Error {
    MainNotExposed {
        exposing: NodeSpan,
        declared: Option<NodeSpan>,
    },
    MainNotTask {
        found: Option<Type>,
        annotation: NodeSpan,
    },
}

What is wrong with the module a manifest’s main names.

Variants

MainNotExposed

The module exposes no value called main.

Fields

exposing: NodeSpan

The module’s exposing (...), which is what has to change.

declared: Option<NodeSpan>

Where the module declares main without exposing it. None when it declares no main at all.

MainNotTask

The module exposes main, and its type is not Task ().

Fields

found: Option<Type>

The type main was judged to have: the one inference solved, or, when the typer marked main unchecked rather than failing it, the one its annotation declares. None only when the annotation cannot be read as a typer type, which no annotation is today: typer::canonical_type_to_typer_type reads every canonical type.

annotation: NodeSpan

main’s annotation, which every exposed value has (An exposed declaration must be annotated).

Trait Implementations

impl Debug for Error

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

Formats the value using the given formatter.

impl PhaseError for Error

fn message(&self) -> String

One line naming what went wrong, in the vocabulary of the user’s source.

fn notes(&self) -> Vec<String>

Supporting detail, one string per rendered note. Empty by default.

fn labels(&self) -> Vec<SpanLabel>

The regions of the user’s source this error is about, if it knows any.

fn message_and_notes(&self) -> Vec<String>

This error’s message followed by its notes.