rustfmt deleting a bunch of code after upgrading to 0.7

[bgourlie]

I just upgraded to rustfmt 0.7. Running cargo fmt deletes a bunch of code in some files while (weirdly enough) also inserting code from other files. To reproduce:

• Clone https://github.com/bgourlie/asm6502.git
• run cargo fmt
• see git diff

[mulkieran]

Having a similar problem:

-#![allow(dead_code)] // only temporary, until more stuff is filled in⏎
+ // only temporary, until more stuff is filled in⏎

Note that the #![allow(dead_code)] is simply removed.

[nrc]

This sounds like #1229. I investigated that, see #1229 (comment)

@mulkieran's thing sounds like a separate issue.

[mulkieran]

@nrc you must be right. My problem seems to have been introduced by the 0.7.0 release; 0.6.3 makes no change.