function markLoneBlock(node) {
			if (loneBlocks.length === 0) {
				return;
			}

			const block = node.parent;

			if (loneBlocks.at(-1) === block) {
				loneBlocks.pop();
			}
		}
Checks the enclosing block of the current node for block-level bindings,
and "marks it" as valid if any.
@param {ASTNode} node The current node to check.
@returns {void}