src/vs/editor/contrib/suggest/browser/suggestMemory.ts/LRUMemory/memorize
class LRUMemory:	memorize(model: ITextModel, pos: IPosition, item: CompletionItem): void {
		const key = `${model.getLanguageId()}/${item.textLabel}`;
		this._cache.set(key, {
			touch: this._seq++,
			type: item.completion.kind,
			insertText: item.completion.insertText
		});
	}