447

[RAprogramm]

Closes #447

thiserror 2.x derive edge-case parity: audited five edge-case classes, fixed two real derive bugs, implemented one missing feature, locked the rest in with tests.

Fixed

• r#source raw-identifier fields: implicit source inference already skipped them correctly, but they were unusable in #[error(\"{source}\")] templates ('unknown field') — member resolution now compares unraw forms (thiserror 2.0 chore(deps): bump itoa from 1.0.16 to 1.0.17 #350 parity)
• Derives on #[deprecated] types/variants emitted deprecation warnings from generated code — expansion now wrapped in #[allow(deprecated)] const _ only when the input is deprecated

Implemented

• Enum-level #[error(fmt = path)] — shared formatter for variants without their own #[error], per-variant overrides (fmt/template/transparent) respected; enum-level templates rejected with specific errors (thiserror 2.0 parity)

Verified working (tests added, no fix needed)

• DST final field (tail: [u8]) derives and implements Display/Error
• Associated types of generic params: masterror-derive propagates declared bounds verbatim and never infers wrong T: Display bounds — the thiserror 2.0.10 bug class can't occur
• Lint hygiene under deny(deprecated, unused_qualifications, clippy::needless_lifetimes, clippy::elidable_lifetime_names, clippy::allow_attributes, clippy::missing_inline_in_public_items)

Tests

10-test edge-case integration file, new trybuild pass/fail cases (enum-level fmt, rejected enum-level template), unit tests for raw-ident handling. Full workspace suite (580 derive unit tests), doctests (176), clippy zero warnings, nightly fmt — all green.

[codecov]

Codecov Report

❌ Patch coverage is 97.96954% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
masterror-derive/src/input/parse_attr.rs	97.22%	3 Missing ⚠️
masterror-derive/src/input/parse.rs	96.87%	1 Missing ⚠️

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