Fixes only a single crate in a workspace?

[djc]

I just tried the 2018 edition upgrade on the Askama repo. For some reason, it fails to apply upgrades in the askama_derive crate (maybe because it's a proc-macro crate)? Exact error messages:

warning: failed to automatically apply fixes suggested by rustc to crate `askama_derive`

after fixes were automatically applied the compiler reported errors within these files:

  * askama_derive/src/lib.rs

This likely indicates a bug in either rustc or rustfix itself,
and we would appreciate a bug report! You're likely to see 
a number of compiler warnings after this message which rustfix
attempted to fix but failed. If you could open an issue at
https://github.com/rust-lang-nursery/rustfix/issues
quoting the full output of this command we'd be very appreciative!

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
 --> askama_derive/src/generator.rs:2:5
  |
2 | use input::TemplateInput;
  |     ^^^^^^^^^^^^^^^^^^^^ help: use `crate`: `crate::input::TemplateInput`
  |
  = note: `-W absolute-paths-not-starting-with-crate` implied by `-W rust-2018-compatibility`
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
  = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
 --> askama_derive/src/generator.rs:3:5
  |
3 | use parser::{self, Cond, Expr, MatchParameter, MatchVariant, Node, Target, When, WS};
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `crate`: `crate::parser::{self, Cond, Expr, MatchParameter, MatchVariant, Node, Target, When, WS}`
  |
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
  = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
 --> askama_derive/src/generator.rs:4:5
  |
4 | use shared::{filters, path};
  |     ^^^^^^^^^^^^^^^^^^^^^^^ help: use `crate`: `crate::shared::{filters, path}`
  |
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
  = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
 --> askama_derive/src/input.rs:1:5
  |
1 | use shared::path;
  |     ^^^^^^^^^^^^ help: use `crate`: `crate::shared::path`
  |
  = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
  = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
   --> askama_derive/src/parser.rs:115:9
    |
115 |     use parser::ContentState::*;
    |         ^^^^^^^^^^^^^^^^^^^^^^^ help: use `crate`: `crate::parser::ContentState::*`
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
    = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
  --> askama_derive/src/lib.rs:15:5
   |
15 | use input::{Print, Source, TemplateInput};
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `crate`: `crate::input::{Print, Source, TemplateInput}`
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
   = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
  --> askama_derive/src/lib.rs:16:5
   |
16 | use parser::{Expr, Macro, Node};
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: use `crate`: `crate::parser::{Expr, Macro, Node}`
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
   = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
  --> askama_derive/src/lib.rs:18:5
   |
18 | use shared::path;
   |     ^^^^^^^^^^^^ help: use `crate`: `crate::shared::path`
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
   = note: for more information, see issue TBD

warning: absolute paths must start with `self`, `super`, `crate`, or an external crate name in the 2018 edition
  --> askama_derive/src/lib.rs:24:1
   |
24 | / pub fn derive_template(input: TokenStream) -> TokenStream {
25 | |     let ast: syn::DeriveInput = syn::parse(input).unwrap();
26 | |     match ast.data {
27 | |         syn::Data::Struct(ref data) => data,
...  |
30 | |     build_template(&ast).parse().unwrap()
31 | | }
   | |_^
   |
   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in the 2018 edition!
   = note: for more information, see issue TBD
help: use `crate`
   |
24 | crate::pub fn derive_template(input: TokenStream) -> TokenStream {
25 |     let ast: syn::DeriveInput = syn::parse(input).unwrap();
26 |     match ast.data {
27 |         syn::Data::Struct(ref data) => data,
28 |         _ => panic!("#[derive(Template)] can only be used with structs"),
29 |     };
 ...

[alexcrichton]

Thanks for the report! I've moved this over to rust-lang/rust#52214