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dtolnay / proc-macro-workshop

Learn to write Rust procedural macros  [Rust Latam conference, Montevideo Uruguay, March 2019]
Apache License 2.0
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Compile fail on newer version of syn and quote on derive_builder unrecognize attribute test #40

Closed ffimnsr closed 2 years ago

ffimnsr commented 2 years ago

In the newer version of syn and quote this 08-unrecognized-attribute.rs builder test fails.

EXPECTED:
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
error: expected `builder(each = "...")`
  --> $DIR/08-unrecognized-attribute.rs:22:7
   |
22 |     #[builder(eac = "arg")]
   |       ^^^^^^^^^^^^^^^^^^^^
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
ACTUAL OUTPUT:
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈
error: expected `builder(each = "...")`
  --> $DIR/08-unrecognized-attribute.rs:22:15
   |
22 |     #[builder(eac = "arg")]
   |               ^^^^^^^^^^^
┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈┈

Rust version: rustc 1.57.0-nightly (c02371c44 2021-10-01) \ syn: 1.0.78 \ quote: 1.0.9

dtolnay commented 2 years ago

I think this isn't a function of the syn or quote version, but the macro implementation written by the person doing the workshop. It's certainly possible to write a macro to produce either one of those error messages.