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Fix a crash on subscript decls in protocols.

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Swift SVN r12277
This commit is contained in:
Chris Lattner
2014-01-14 04:33:45 +00:00
parent b0b5a8f774
commit 5c23e3568c
1 changed files with 3 additions and 1 deletions
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4
lib/Sema/CSSimplify.cpp
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@@ -1526,7 +1526,9 @@ ConstraintSystem::simplifyMemberConstraint(const Constraint &constraint) {
// Subscripts are ok on rvalues so long as the getter is @!mutating.
if (auto *SD = dyn_cast<SubscriptDecl>(result))
if (SD->getGetter()->isMutating())
// The subscript decl won't have a getter if this is in protocol. In
// that case, we assume it is non-mutating.
if (SD->getGetter() && SD->getGetter()->isMutating())
continue;
// Computed properties are ok on rvalues so long as the getter is