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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [coroutines] assertion failure diagnosing bad coroutine await_suspend function"
href="https://bugs.llvm.org/show_bug.cgi?id=34982">34982</a>
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<th>Summary</th>
<td>[coroutines] assertion failure diagnosing bad coroutine await_suspend function
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>unspecified
</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++
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<th>Assignee</th>
<td>gornishanov@gmail.com
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<th>Reporter</th>
<td>richard-llvm@metafoo.co.uk
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Testcase:
#include <experimental/coroutine>
namespace std { using namespace std::experimental; }
struct corotype {
struct promise_type {
std::suspend_always initial_suspend();
std::suspend_always final_suspend();
};
bool await_ready() { return false; }
void await_suspend();
};
static corotype f() {
}
void h();
corotype g() {
auto a = f();
while (co_await a) h();
}
Results in an assertion failure when diagnosing the bad await_suspend function:
<stdin>:17:10: error: too many arguments to function call, expected 0, have 1
clang-6.0:
/usr/local/google/home/richardsmith/build/llvm-2/src/tools/clang/lib/Frontend/TextDiagnostic.cpp:1015:
void highlightRange(const clang::CharSourceRange &, unsigned int,
clang::FileID, const (anonymous namespace)::SourceColumnMap &, std::string &,
const clang::SourceManager &, const clang::LangOptions &): Assertion
`StartColNo <= EndColNo && "Invalid range!"' failed.</pre>
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