From 7349dc5cff49cf22c82eb912813e47f30cd7a757 Mon Sep 17 00:00:00 2001 From: Julius Ikkala Date: Sat, 28 Jun 2025 05:39:24 +0300 Subject: Minimal optional constraints (#7422) * Parse optional witness syntax * Allow failing optional constraint * Make `is` work with optional constraint * Allow using optional constraint in checked if statements * Fix tests * Make it work with structs * Fix MSVC build error * Disallow using `as` with optional constraints * Update test to match split is/as errors * Add tests * Fix uninitialized variables in tests * Add tests of incorrect uses & fix related bugs * Mention optional constraints in docs * format code * Fix type unification with NoneWitness * Fix formatting --------- Co-authored-by: slangbot <186143334+slangbot@users.noreply.github.com> Co-authored-by: Nathan V. Morrical --- source/slang/slang-ir-lower-generic-call.cpp | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'source/slang/slang-ir-lower-generic-call.cpp') diff --git a/source/slang/slang-ir-lower-generic-call.cpp b/source/slang/slang-ir-lower-generic-call.cpp index 80b258407..41a78d00c 100644 --- a/source/slang/slang-ir-lower-generic-call.cpp +++ b/source/slang/slang-ir-lower-generic-call.cpp @@ -295,9 +295,17 @@ struct GenericCallLoweringContext return; } - auto interfaceType = cast( + auto interfaceType = as( cast(lookupInst->getWitnessTable()->getDataType()) ->getConformanceType()); + + if (!interfaceType) + { + // NoneWitness -> remove call. + callInst->removeAndDeallocate(); + return; + } + if (isBuiltin(interfaceType)) return; -- cgit v1.2.3