Rollup of 5 pull requests

[matthiaskrgr]

Successful merges:

• Use Vec extend instead of repeated pushes on several places #91042 (Use Vec extend instead of repeated pushes on several places)
• Improve 'cannot contain emoji' error. #91476 (Improve 'cannot contain emoji' error.)
• Pretty print break and continue without redundant space #91568 (Pretty print break and continue without redundant space)
• Implement core::future::join! #91645 (Implement core::future::join!)
• update Miri #91666 (update Miri)

Failed merges:

r? @ghost
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