src/vs/editor/contrib/snippet/snippetVariables.ts/CommentBasedVariableResolver/resolve
class CommentBasedVariableResolver:	resolve(variable: Variable): string | undefined {
		const { name } = variable;
		const langId = this._model.getLanguageIdAtPosition(this._selection.selectionStartLineNumber, this._selection.selectionStartColumn);
		const config = LanguageConfigurationRegistry.getComments(langId);
		if (!config) {
			return undefined;
		}
		if (name === 'LINE_COMMENT') {
			return config.lineCommentToken || undefined;
		} else if (name === 'BLOCK_COMMENT_START') {
			return config.blockCommentStartToken || undefined;
		} else if (name === 'BLOCK_COMMENT_END') {
			return config.blockCommentEndToken || undefined;
		}
		return undefined;
	}