function getEnclosingFunctionScope(scope) {
	let currentScope = scope;

	while (currentScope.type !== "function" && currentScope.type !== "global") {
		currentScope = currentScope.upper;
	}
	return currentScope;
}
Finds the nearest function scope or global scope walking up the scope
hierarchy.
@param {eslint-scope.Scope} scope The scope to traverse.
@returns {eslint-scope.Scope} a function scope or global scope containing the given
     scope.