spirv attribute errors in proc macros don't show errors properly due to span being the macro invocation

If you codegen spirv entry points and you typo an attribute, you get this error not showing you which one you typo'ed, since the span is from the macro invocation.

  error: unknown argument to spirv attribute
    --> node-graph/graster-nodes/src/adjustments.rs:44:1
     |
  44 | #[node_macro::node(category("Raster: Adjustment"), shader_node(PerPixelAdjust))]
     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     |
     = note: this error originates in the attribute macro `node_macro::node` (in Nightly builds, run with -Z macro-backtrace for more info)

System Info

• Rust-GPU master

node-graph/graster-nodes/src/adjustments.rs:44 の spirv 属性の誤記を再現し、node_macro::node 属性マクロのエラー報告を調査してください。属性の span がどのように選択されるかを追跡し、その後、未知の引数によってマクロ呼び出しだけでなく問題の属性が特定されることを確認してください。