Rollup of 6 pull requests

[matthiaskrgr]

Successful merges:

• Remove NullOp::Box #90102 (Remove NullOp::Box)
• Use field span in rustc_macros when emitting decode call #92011 (Use field span in rustc_macros when emitting decode call)
• Suggest while let x = y when encountering while x = y #92402 (Suggest while let x = y when encountering while x = y)
• Couple of libtest cleanups #92409 (Couple of libtest cleanups)
• Fix spacing in pretty printed PatKind::Struct with no fields #92418 (Fix spacing in pretty printed PatKind::Struct with no fields)
• Consolidate Result's and Option's methods into fewer impl blocks #92444 (Consolidate Result's and Option's methods into fewer impl blocks)

Failed merges:

• Stabilize result_cloned and result_copied #92483 (Stabilize result_cloned and result_copied)

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