Creating implementation for idiom 276 : Insert an element in a set

Idiom

# 276 Insert an element in a set

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Insert an element e into the set x.

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#include <set>

x.insert(e);

x.add(e);

x[e] = true

x[e] = struct{}{}

x.add(e);

import java.util.Set;

x.add(e)

x[e] = true

Include(x,e);

x := x + [e];

use Set::Scalar;

$x = Set::Scalar->new;
$e = 'an element';
$x->insert($e);

x.add(e)

require 'set'

x.add(e)

x << e

use std::collections::HashSet

x.insert(e);