Basic: guard against nullptr for env
#19121
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`env` is a default'ed parameter. In some cases it may be passed a `nullptr`, which is not a valid parameter to `llvm::toStringRefArray`. Guard against this case. This allows the swift compiler to work again on Windows!
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@swift-ci please test and merge |
jrose-apple
approved these changes
Sep 4, 2018
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envis a default'ed parameter. In some cases it may be passed anullptr,which is not a valid parameter to
llvm::toStringRefArray. Guard against thiscase. This allows the swift compiler to work again on Windows!
Replace this paragraph with a description of your changes and rationale. Provide links to external references/discussions if appropriate.
Resolves SR-NNNN.