function IMPLIED_STRICT(pattern) {
	pattern.code = `/* implied strict mode */ ${pattern.code}`;
	pattern.languageOptions = pattern.languageOptions || {};
	pattern.languageOptions.parserOptions =
		pattern.languageOptions.parserOptions || {};
	pattern.languageOptions.parserOptions.ecmaFeatures =
		pattern.languageOptions.parserOptions.ecmaFeatures || {};
	pattern.languageOptions.parserOptions.ecmaFeatures.impliedStrict = true;
}
A constant value for implied strict mode.
This modifies pattern object to impose strict mode.
@param {Object} pattern A pattern object to modify.
@returns {void}