src/vs/workbench/contrib/tasks/common/problemMatcher.ts/ProblemPatternParser/createSingleProblemPattern
class ProblemPatternParser:	private createSingleProblemPattern(value: Config.ICheckedProblemPattern): IProblemPattern | null {
		const result = this.doCreateSingleProblemPattern(value, true);
		if (result === undefined) {
			return null;
		} else if (result.kind === undefined) {
			result.kind = ProblemLocationKind.Location;
		}
		return this.validateProblemPattern([result]) ? result : null;
	}