[akasakariko]

Summary

• Expand peer macros once for each named variable, keeping the complete declaration on every call
• Handle tuple and wildcard patterns without altering accessor macro restrictions
• Cover member, top-level and local declarations, unique generated peers, empty expansions and repeated diagnostics

Reproduction

• Reproduced on unmodified main at 574f42037e7fa2bcc62bfc0188c585dd3c9e4b2a using the generic assertion core called by assertMacroExpansion
• The empty peer macro produced an unexpected single-variable diagnostic while the native compiler accepted the same source
• Compiler probes confirmed that every invocation receives the complete declaration, including all bindings

Validation

• The four affected regression tests fail on the original implementation, all eight peer macro tests pass after the fix
• Linux macro suite, SKIP_LONG_TESTS=1 swift test --jobs 1 -Xswiftc -disable-batch-mode --filter SwiftSyntaxMacroExpansionTest, 141 XCTest cases and 2 Swift Testing cases pass
• Linux full quick suite, SKIP_LONG_TESTS=1 swift test --skip-build, 3538 XCTest cases with 9 skips and no failures, plus 2 passing Swift Testing cases
• Native macOS compiler checks and the generic assertion reproduction pass
• Strict Swift formatting lint and git diff --check pass

AI assistance

• This change was implemented and checked with AI assistance

Fixes #3320