src/vs/editor/contrib/gotoError/gotoErrorWidget.ts/MessageWidget/getAriaLabel
class MessageWidget:	private getAriaLabel(marker: IMarker): string {
		let severityLabel = '';
		switch (marker.severity) {
			case MarkerSeverity.Error:
				severityLabel = nls.localize('Error', "Error");
				break;
			case MarkerSeverity.Warning:
				severityLabel = nls.localize('Warning', "Warning");
				break;
			case MarkerSeverity.Info:
				severityLabel = nls.localize('Info', "Info");
				break;
			case MarkerSeverity.Hint:
				severityLabel = nls.localize('Hint', "Hint");
				break;
		}

		let ariaLabel = nls.localize('marker aria', "{0} at {1}. ", severityLabel, marker.startLineNumber + ':' + marker.startColumn);
		const model = this._editor.getModel();
		if (model && (marker.startLineNumber <= model.getLineCount()) && (marker.startLineNumber >= 1)) {
			const lineContent = model.getLineContent(marker.startLineNumber);
			ariaLabel = `${lineContent}, ${ariaLabel}`;
		}
		return ariaLabel;
	}