``` error: macros that expand to items must be delimited with braces or followed by a semicolon --> buildpacks/ruby/src/layers/bundle_install_layer.rs:120:1 | 120 | / try_migrate_deserializer_chain!( 121 | | chain: [MetadataV1, MetadataV2, MetadataV3], 122 | | error: MetadataMigrateError, 123 | | deserializer: toml::Deserializer::new, 124 | | ); | |_^ | = note: this error originates in the macro `$crate::try_migrate_link` which comes from the expansion of the macro `try_migrate_deserializer_chain` (in Nightly builds, run with -Z macro-backtrace for more info) ``` Or with nightly: ``` $ RUSTFLAGS="-Zmacro-backtrace" cargo build error: macros that expand to items must be delimited with braces or followed by a semicolon --> /Users/rschneeman/.cargo/registry/src/index.crates.io-6f17d22bba15001f/magic_migrate-0.2.0/src/lib.rs:437:34 | 419 | macro_rules! try_migrate_link { | ----------------------------- in this expansion of `$crate::try_migrate_link!` (#3) ... 437 | $crate::try_migrate_link!($b, $($rest),*) | ^^^^^^^^^^^^^^^^ ... 714 | macro_rules! try_migrate_deserializer_chain { | ------------------------------------------- | | | in this expansion of `try_migrate_deserializer_chain!` (#1) | in this expansion of `$crate::try_migrate_deserializer_chain!` (#2) ... 737 | $crate::try_migrate_link!($a, $($rest),+); | ----------------------------------------- in this macro invocation (#3) ... 764 | $crate::try_migrate_deserializer_chain!(error: $err, deserializer: $deser, chain: [$a, $($rest),+]); | --------------------------------------------------------------------------------------------------- in this macro invocation (#2) | ::: buildpacks/ruby/src/layers/bundle_install_layer.rs:120:1 | 120 | / try_migrate_deserializer_chain!( 121 | | chain: [MetadataV1, MetadataV2, MetadataV3], 122 | | error: MetadataMigrateError, 123 | | deserializer: toml::Deserializer::new, 124 | | ); | |_- in this macro invocation (#1) error: could not compile `heroku-ruby-buildpack` (bin "heroku-ruby-buildpack") due to 1 previous error ``` I'm committing it because I want to figure out how to write a test case for this failure mode in the `magic_migrate` library.

Commits

Commits on Dec 12, 2024

Upgrade Rust version

Add CacheDiff to dependencies

Import and implement CacheDiff derive macro

Use CacheDiff implementation for MetadataDiff

This code fails to compile with an error