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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - assertion if pack expansion of lambda contains struct with member function with dependent decl"
href="http://llvm.org/bugs/show_bug.cgi?id=17985">17985</a>
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<th>Summary</th>
<td>assertion if pack expansion of lambda contains struct with member function with dependent decl
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++11
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
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<th>CC</th>
<td>david.majnemer@gmail.com, dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>This causes IRgen to assert:
template<typename ...T> void g(T...);
template<typename ...T> void f() {
g(
[]{
struct S { T f() { static T t; return ++t; } } s;
return s.f();
}()...
);
}
template void f<int, int, int>();
The instantiation of S::f inside each lambda looks like this:
CXXMethodDecl 0x6a9a480 <col:22, col:54> f 'int (void)'
`-CompoundStmt 0x6aa1628 <col:28, col:54>
|-DeclStmt 0x6aa15a8 <col:30, col:40>
| `-VarDecl 0x6aa1550 <col:30, col:39> t 'T' static
`-ReturnStmt 0x6aa1608 <col:42, col:51>
`-UnaryOperator 0x6aa15e8 <col:49, col:51> '<dependent type>' prefix '++'
`-DeclRefExpr 0x6aa15c0 <col:51> 'T' lvalue Var 0x6aa1550 't' 'T'
That's clearly bogus: we should have substituted for T here.
Net result: IRgen asserts:
clang-3.4: lib/AST/Type.cpp:887: bool clang::Type::isConstantSizeType() const:
Assertion `!isDependent
Type() && "This doesn't make sense for dependent types"' failed.</pre>
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