Enum SubstitutionError 

pub enum SubstitutionError {
    VariableNotFound {
        var_name: String,
        location: String,
    },
    VariableRejected {
        var_name: String,
        reason: String,
        policy: String,
    },
    InvalidSubstitutionSyntax {
        value: String,
        reason: String,
    },
}

Error type for environment variable substitution failures.

Variants

VariableNotFound

A referenced environment variable does not exist in the process environment.

Fields

var_name: String

Name of the missing variable.

location: String

Config file or section where the placeholder appeared.

VariableRejected

A variable was found but rejected by the active substitution policy.

Fields

var_name: String

Name of the rejected variable.

reason: String

Human-readable reason the policy rejected the variable.

policy: String

Description of the policy that rejected the variable.

InvalidSubstitutionSyntax

The substitution syntax in the config value is malformed.

Fields

value: String

The raw config value containing the malformed placeholder.

reason: String

Description of the syntax error.

Trait Implementations

impl Clone for SubstitutionError

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 SubstitutionError

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

Formats the value using the given formatter.

impl Display for SubstitutionError

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

Formats the value using the given formatter.

impl Error for SubstitutionError

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 SubstitutionError

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for SubstitutionError