rust-lang / rust-lang/rfcs

DebugTuple builder needs more options controlling its behaviour

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Description

DebugTuple should have options controlling how to output tuples with 0 and 1 element.

Currently if 0 fields are provided, only the name passed into debug_tuple is printed. Would be nice if there was option to print {name}().

Currently if only 1 field is provided, trailing comma is not printed. There should be an option to add one: (value,).

These could be added as option setters on the DebugTuple builder. E.g. fn empty_tuple(bool) and fn trailing_comma(bool).

That would make debug_tuple actually usable to print tuples.

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  3. Fork the repository and make your change on a branch.
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Research direction

Start by reading the DebugTuple builder and debug_tuple entry point described in the issue, along with the surrounding Rust API design context. Define the behavior for zero-field output and one-field trailing commas, then determine the appropriate option setters and validation needed for the proposal to be complete.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
developer-experience
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
30/100

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