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[4.2][Stmt] Do not crash if we have a switch after a fallthrough. #17530

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Merged
merged 1 commit into from
Jun 27, 2018
Merged

[4.2][Stmt] Do not crash if we have a switch after a fallthrough. #17530

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4 changes: 2 additions & 2 deletions lib/Sema/TypeCheckStmt.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 @@ -948,7 +948,7 @@ class StmtChecker : public StmtVisitor<StmtChecker, Stmt*> {

// If the previous case fellthrough, similarly check that that case's bindings
// includes our first label item's pattern bindings and types.
if (PreviousFallthrough) {
if (PreviousFallthrough && previousBlock) {
auto firstPattern = caseBlock->getCaseLabelItems()[0].getPattern();
SmallVector<VarDecl *, 4> Vars;
firstPattern->collectVariables(Vars);
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14 changes: 14 additions & 0 deletions test/stmt/switch_stmt2.swift
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Expand Up @@ -136,3 +136,17 @@ func non_fully_covered_switch(x: Int) -> Int {
}
return x
}

// Do not crash if another switch statement follows a fallthrough.
func fallthrough_not_last(i: Int) {
switch i {
case 1:
fallthrough
switch i {
case 1: break
default: break
}
default:
break
}
}