extensions/typescript-language-features/src/languageFeatures/quickFix.ts/DiagnosticsSet/from
class DiagnosticsSet:	public static from(diagnostics: vscode.Diagnostic[]) {
		const values = new Map<string, vscode.Diagnostic>();
		for (const diagnostic of diagnostics) {
			values.set(DiagnosticsSet.key(diagnostic), diagnostic);
		}
		return new DiagnosticsSet(values);
	}