lean4-htt/tests/pkg/issue12825/lean-toolchain at b2aec782ebd8529e745843b50d6cd3dbad36a9a6 - max/lean4-htt - maxgit: wireguard access, git repository.

max/lean4-htt

Joachim Breitner b2aec782eb

fix: re-privatize constant name prefix in realizeConst to avoid diamond import collisions (#12964 )

This PR fixes an issue where `realizeConst` would generate auxiliary
declarations
(like `_sparseCasesOn`) using the original defining module's private
name prefix
rather than the realizing module's prefix. When two modules
independently realized
the same imported constant, they produced identically-named auxiliary
declarations,
causing "environment already contains" errors on diamond import.

The fix re-privatizes the constant name under the current module before
passing it
to `withDeclNameForAuxNaming`, ensuring each realizing module generates
distinctly
named auxiliary declarations.

Fixes #12825

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-18 13:54:50 +00:00

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