Detect duplicate sibling modules in recursive module groups#19913
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T-Gro wants to merge 3 commits into
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Detect duplicate sibling modules in recursive module groups#19913T-Gro wants to merge 3 commits into
T-Gro wants to merge 3 commits into
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Add 7 tests in ErrorMessages/ModuleTests.fs locking the desired behavior: duplicate sibling modules in a 'module rec' / 'namespace rec' must produce FS0037 at type-check time, not FS2014 from IL emit. Filtered run (--filter-class ErrorMessages.Modules): total: 20, failed: 3, succeeded: 17 RED (positive, fail today): - Recursive module with duplicate sibling modules emits FS0037 - Recursive namespace with duplicate sibling modules emits FS0037 - Recursive module nested siblings with duplicate name emit FS0037 GREEN (negative regression guards, pass today): - Recursive module nested cousins with same name compile - Non-recursive module with duplicate sibling modules still emits FS0037 - Single file with two namespace fragments and different modules compiles - Recursive module siblings differing only in case compile Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
…ublish time In `module rec` / `namespace rec` groups all siblings share the same envInitial during Phase1A, so the existing CheckForDuplicateModule call in TcTyconDefnCore_Phase1A_BuildInitialModule cannot see them. Move the check to the Phase1AB publish point where envAbove's accumulator already contains earlier-published siblings. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
…ostic Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Fixes #6694