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[Sema] Fix a crash in rethrows checking. #16915

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Merged
merged 1 commit into from
May 31, 2018
Merged

[Sema] Fix a crash in rethrows checking. #16915

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7 changes: 2 additions & 5 deletions lib/Sema/TypeCheckError.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Copyright (c) 2014 - 2018 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
Expand Down Expand Up @@ -770,7 +770,7 @@ class ApplyClassifier {

auto mapping = shuffle->getElementMapping();
for (unsigned destIndex = 0; destIndex != mapping.size(); ++destIndex) {
auto srcIndex = shuffle->getElementMapping()[destIndex];
auto srcIndex = mapping[destIndex];
if (srcIndex >= 0) {
origSrcElts[srcIndex] = origParamTupleType->getElement(destIndex);
} else if (srcIndex == TupleShuffleExpr::DefaultInitialize ||
Expand All @@ -785,9 +785,6 @@ class ApplyClassifier {
origSrcElts[srcIndex] =
origParamTupleType->getASTContext().TheRawPointerType;
}

// We're done iterating these elements.
break;
} else {
llvm_unreachable("bad source-element mapping!");
}
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6 changes: 6 additions & 0 deletions test/decl/func/rethrows.swift
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Expand Up @@ -545,3 +545,9 @@ func rethrowsWithCaptureList<R, T>(
return try operation(array.count)
}
}

// rdar://problem/40472018: Crash on rethrows function with variadic parameter and throwing function parameter.
public func variadic_rethrows(_ values: Int..., body: (Int) throws -> ()) rethrows { }
public func rdar40472018() {
variadic_rethrows(1, 2) { _ in }
}