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pub enum Fail {
    ArgumentMissing(String),
    UnrecognizedOption(String),
    OptionMissing(String),
    OptionDuplicated(String),
    UnexpectedArgument(String),
}
Expand description

The type returned when the command line does not conform to the expected format. Use the Debug implementation to output detailed information.

Variants

ArgumentMissing(String)

The option requires an argument but none was passed.

UnrecognizedOption(String)

The passed option is not declared among the possible options.

OptionMissing(String)

A required option is not present.

OptionDuplicated(String)

A single occurrence option is being used multiple times.

UnexpectedArgument(String)

There’s an argument being passed to a non-argument option.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Formats the value using the given formatter. Read more

👎 Deprecated since 1.42.0:

use the Display impl or to_string()

The lower-level source of this error, if any. Read more

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

Returns a stack backtrace, if available, of where this error occurred. Read more

👎 Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

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

Uses borrowed data to replace owned data, usually by cloning. Read more

Converts the given value to a String. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.