src/vs/workbench/contrib/tasks/common/problemMatcher.ts/ProblemMatcherParser/parse
class ProblemMatcherParser:	public parse(json: Config.ProblemMatcher): ProblemMatcher | undefined {
		const result = this.createProblemMatcher(json);
		if (!this.checkProblemMatcherValid(json, result)) {
			return undefined;
		}
		this.addWatchingMatcher(json, result);

		return result;
	}