Documentation and results do not match

[Jixiangup]

• I have searched open and closed issues and pull requests for duplicates, using these search terms:

• I have checked the latest main branch to see if this has already been fixed, in this file:

URL to the section(s) of the book with this problem: https://doc.rust-lang.org/book/ch17-04-streams.html#streams-futures-in-sequence

Description of the problem:
Use the code in the document:

The prompt will report an error, but when I run the same code, it works fine. Please correct it.

• Rust version info

coloxan@96 example % rustc --version
rustc 1.86.0 (05f9846f8 2025-03-31)
coloxan@96 example % cargo --version
cargo 1.86.0 (adf9b6ad1 2025-02-28)

Suggested fix:

[Jixiangup]

Is this a problem or has it been improved in newer Rust versions?