Tracking issue for TryFrom/TryInto traits

[alexcrichton]

Tracking issue for rust-lang/rfcs#1542

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To do:

• Is existing documentation satisfactory?
• Change bounds on TryFrom blanket impl to use Into instead of From #56796 Change bounds on TryFrom blanket impl to use Into instead of From
• (Re)stabilization PR

[Zoxc]

Is there a way to generically print an error with the original value if the conversion fails without requiring Clone so a related method which panics on failure could have nice error messages?

[chris-morgan]

A discussion of whether this should go in the prelude is pending for when this goes stable.