error: Cannot infer type of lambda

error: Cannot infer type of lambda: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). Repro: That error message was introduced in 6edd1b96f39189877b7650082dc0e2eec7b4b34c ("Fix lambda type inference special cases").