Enum RuleError 

#[non_exhaustive]
pub enum RuleError {
    UnknownKind {
        name: String,
    },
    DuplicateNode {
        name: String,
    },
    IndentTooWide {
        columns: u8,
    },
    SeparatorIsDelimiter {
        node: String,
    },
    TrailingNeedsDelimiters {
        node: String,
    },
}

Why Rules::compile refused a set of rules.

Every variant names the offending kind, so the message can point at the right line of a sketch.

Examples

use fmt_lang::{NodeRule, RuleError, Rules};

let err = Rules::new().node(NodeRule::new("objekt")).compile(|_| None::<u8>).unwrap_err();
assert_eq!(err, RuleError::UnknownKind { name: "objekt".into() });

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

UnknownKind

A rule names a kind the language does not have. Fix the spelling, or mark the rule optional if it comes from a preset meant for several languages.

Fields

name: String

The name as written in the rule.

DuplicateNode

Two node rules name the same kind. Merge them into one rule.

Fields

name: String

The kind both rules name.

IndentTooWide

The indentation step is wider than MAX_INDENT_STEP columns.

Fields

columns: u8

The step that was asked for.

SeparatorIsDelimiter

A node’s separator is also one of its delimiters, so the formatter cannot tell the two roles apart. Use distinct kinds.

Fields

node: String

The node rule.

TrailingNeedsDelimiters

A node rule sets a trailing-separator policy other than Trailing::Preserve but no delimiters. The policy needs the closing delimiter to know where the list ends; add delimiters or keep Preserve.

Fields

node: String

The node rule.

Trait Implementations

impl Clone for RuleError

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RuleError

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

Formats the value using the given formatter.

impl Display for RuleError

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

Formats the value using the given formatter.

impl Eq for RuleError

impl Error for RuleError

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.

impl PartialEq for RuleError

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for RuleError