letions } = completion(textUntilPosition);

              let result = completions.map(result => ({
                label: result,
                documentation: "",
                kind: monaco.languages.CompletionItemKind.Function,
                insertText: result,
              }));
              return { suggestions: result };
            },
          });

          editor = monaco.editor.create(el, {
            value: `let a = `,
            language: "rust",
            theme: "vs-dark",
          