src/vs/editor/contrib/wordHighlighter/wordHighlighter.ts/OccurenceAtPositionRequest/constructor
class OccurenceAtPositionRequest:	constructor(model: ITextModel, selection: Selection, wordSeparators: string) {
		this._wordRange = this._getCurrentWordRange(model, selection);
		this.result = createCancelablePromise(token => this._compute(model, selection, wordSeparators, token));
	}