---
id: pr-flashinfer-2772
repo: flashinfer-ai/flashinfer
pr: 2772
title: 'Fix compilation error: add missing <optional> header'
author: he-yufeng
date: '2026-04-13'
url: https://github.com/flashinfer-ai/flashinfer/pull/2772
source_category: upstream-code
architectures:
- sm100
tags: []
techniques: []
hardware_features: []
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: 56784716a12a6a15dfb674a2251d28a27e3f15e3
inclusion_reason: defer
changed_paths:
- include/flashinfer/comm/trtllm_allreduce_fusion.cuh
- include/flashinfer/comm/trtllm_moe_allreduce_fusion.cuh
artifact_dir: evidence/pull-bundles/flashinfer/gh-2772
head_ref_oid: 58008c249e83dcf4f5dc7a8eac0cffb40c9d4ac8
---
# Fix compilation error: add missing <optional> header

- Repository: `flashinfer-ai/flashinfer`
- PR: [2772](https://github.com/flashinfer-ai/flashinfer/pull/2772)
- Decision: `defer`
- Reason: defer

## Changed Paths

- `include/flashinfer/comm/trtllm_allreduce_fusion.cuh`
- `include/flashinfer/comm/trtllm_moe_allreduce_fusion.cuh`

## Evidence Bundle

`evidence/pull-bundles/flashinfer/gh-2772`
