Rogue commas after match blocks in ch 18-03

[ShevekUK]

Listings 18-15 and 18-16 have inconsistent use of commas after brace-delimited match arms.

In 18-15, the first arm is a block and ends with a comma. The second and fourth arms are also blocks, and end without commas.

Similarly in listing 18-16 the first and second match arms are brace-delimited, but only the first ends with a comma.

I've checked and rustfmt does strip these commas.

As a Rust learner, there are two things I'd point out here:

• the inconsistency is confusing for learners, who will wonder what the rules are for commas here
• shouldn't all listings go through rustfmt?

Anyway I'm just a learner but was encouraged to mention this here.

[carols10cents]

Yes, we are currently working on the infrastructure to apply rustfmt to all examples; that's #1690. Closing this as a duplicate of that! Thank you!

[ShevekUK]

Thanks for not dismissing this out of hand, and keep up the good work 😀