Trait Pattern 

pub trait Pattern {
    // Required method
    fn is_matching(&self, val: char) -> bool;
}

While https://github.com/rust-lang/rust/issues/27721 is pending we need to define our own minimal Pattern trait.

Pattern type	Match condition
char	is contained in string
&[char]	any char in slice is contained in string
F: FnMut(char) -> bool	F returns true for a char in string

Required Methods

fn is_matching(&self, val: char) -> bool

Returns whether the character is matching the pattern.

Implementations on Foreign Types

impl Pattern for &[char]

fn is_matching(&self, val: char) -> bool

impl Pattern for char

fn is_matching(&self, val: char) -> bool

Implementors

impl<F: Fn(char) -> bool> Pattern for F