src/vs/workbench/api/common/extHostTypes.ts/Task/problemMatchers
class Task:	set problemMatchers(value: string[]) {
		if (!Array.isArray(value)) {
			this.clear();
			this._problemMatchers = [];
			this._hasDefinedMatchers = false;
			return;
		} else {
			this.clear();
			this._problemMatchers = value;
			this._hasDefinedMatchers = true;
		}
	}