Compile failed with nightly-2018-04-08-i686-pc-windows-gnu.

[zoumi]

error[E0432]: unresolved import `proc_macro::TokenNode`
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\data-encoding-macro-internal-0.1.1\src\lib.rs:22:27
   |
22 | use proc_macro::{Spacing, TokenNode, TokenStream, TokenTree, TokenTreeIter};
   |                           ^^^^^^^^^ no `TokenNode` in the root. Did you mean to use `TokenTree`?

error[E0432]: unresolved import `proc_macro::TokenTreeIter`
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\data-encoding-macro-internal-0.1.1\src\lib.rs:22:62
   |
22 | use proc_macro::{Spacing, TokenNode, TokenStream, TokenTree, TokenTreeIter};
   |                                                              ^^^^^^^^^^^^^ no `TokenTreeIter` in the root. Did you mean to use `TokenTree`?

   Compiling libflate v0.1.14
error[E0574]: expected struct, variant or union type, found enum `TokenTree`
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\data-encoding-macro-internal-0.1.1\src\lib.rs:34:14
   |
34 |         Some(TokenTree { span: _, kind: TokenNode::Op(x, Spacing::Alone) })
   |              ^^^^^^^^^ not a struct, variant or union type

error[E0432]: unresolved import `syntax::ast::SpannedIdent`
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\pear_codegen-0.0.12\src\lib.rs:27:56
   |
27 | use syntax::ast::{ItemKind, MetaItem, FnDecl, PatKind, SpannedIdent};
   |                                                        ^^^^^^^^^^^^ no `SpannedIdent` in `ast`

   Compiling flate2 v1.0.1
error[E0277]: the trait bound `str: std::marker::Sized` is not satisfied
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\data-encoding-macro-internal-0.1.1\src\lib.rs:52:13
   |
52 |         let key = match key.kind {
   |             ^^^ `str` does not have a constant size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `str`
   = note: all local variables must have a statically known size

error[E0277]: the trait bound `str: std::marker::Sized` is not satisfied
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\data-encoding-macro-internal-0.1.1\src\lib.rs:58:21
   |
58 |             None => panic!("expected value for {}", key),
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `str` does not have a constant size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `str`
   = note: required by `std::fmt::ArgumentV1::new`
   = note: this error originates in a macro outside of the current crate (in Nightly builds, run with -Z external-macro-backtrace for more info)

error[E0277]: the trait bound `str: std::marker::Sized` is not satisfied
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\data-encoding-macro-internal-0.1.1\src\lib.rs:62:21
   |
62 |         let _ = map.insert(key, value);
   |                     ^^^^^^ `str` does not have a constant size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `str`

error[E0277]: the trait bound `str: std::marker::Sized` is not satisfied
  --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\data-encoding-macro-internal-0.1.1\src\lib.rs:50:19
   |
50 |     let mut map = HashMap::new();
   |                   ^^^^^^^^^^^^ `str` does not have a constant size known at compile-time
   |
   = help: the trait `std::marker::Sized` is not implemented for `str`
   = note: required by `<std::collections::HashMap<K, V>>::new`

error: aborting due to 7 previous errors

Some errors occurred: E0277, E0432, E0574.
For more information about an error, try `rustc --explain E0277`.
error[E0609]: no field `identifier` on type `syntax::ast::PathSegment`
   --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\pear_codegen-0.0.12\src\lib.rs:136:59
    |
136 |             let penultimate = path.segments[num_segs - 2].identifier.name.as_str();
    |                                                           ^^^^^^^^^^ unknown field
    |
    = note: available fields are: `ident`, `parameters`

error[E0609]: no field `identifier` on type `syntax::ast::PathSegment`
   --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\pear_codegen-0.0.12\src\lib.rs:143:48
    |
143 |         let last = path.segments[num_segs - 1].identifier.name.as_str();
    |                                                ^^^^^^^^^^ unknown field
    |
    = note: available fields are: `ident`, `parameters`

error[E0609]: no field `identifier` on type `syntax::ast::PathSegment`
   --> E:\rustdir\registry\src\mirrors.xx.com-27933024a10d4e91\pear_codegen-0.0.12\src\lib.rs:152:40
    |
152 |     let first_ident = path.segments[0].identifier.name.as_str();
    |                                        ^^^^^^^^^^ unknown field
    |
    = note: available fields are: `ident`, `parameters`

error: aborting due to 4 previous errors

Some errors occurred: E0432, E0609.
For more information about an error, try `rustc --explain E0432`.
error: Could not compile `data-encoding-macro-internal`.
warning: build failed, waiting for other jobs to finish...
error: Could not compile `pear_codegen`.
warning: build failed, waiting for other jobs to finish...
error: build failed

[ia0]

Hi @zoumi,

Thanks for your bug report! I'll try to fix it this week-end if I get the time, but it might take quite some time. Is this blocking?

Also, could you provide me with more contextual information? What are you building and with which command-line?

You theoretically should not get this error for the following reasons:

• You should not build data-encoding-macro-internal directly. Instead you should use data-encoding-macro.
• You probably use cargo build --no-default-features when building data-encoding-macro. If this is the case a simple workaround would be to use cargo build (or cargo build --features=stable to be explicit) until this issue is fixed.

Thanks again!

[zoumi]

@ia0 Thank you for responding so quickly!
I'm building a library depends on data-encoding and data-encoding-macro.
Here is the configure in my Cargo.toml:

data-encoding = "^2.1"
data-encoding-macro = { version = "^0.1", default-features = false }

I was trying to test your bug fix just now. But unluckily, my library also depend on rand 0.5 which build failed too. I will fallback my rust to nightly 1.26.

[ia0]

Thanks for the additional information! It makes a lot of sense.

I ended publishing the data-encoding-macro-internal crate. So the issue should now be fixed (you may need to run cargo update though) without any additional action (like removing default-features = false or using the master branch) from your part.