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10aef62f21
This means that:
1) Scoped messages are always removed at the end of their scope,
even if the scope ended due to an exception.
2) Scoped messages outlive section end, if that section's scope is
enclosed in their own.
Previously neither of these were true, which has led to a number
of surprising behaviour, where e.g. this:
```cpp
TEST_CASE() {
try {
INFO( "some info" );
throw std::runtime_error( "ex" );
} catch (std::exception const&) {}
REQUIRE( false );
}
```
would print "some info" as the message for the assertion, while this:
```cpp
TEST_CASE() {
INFO("Hello");
SECTION("dummy") {}
REQUIRE(false);
}
```
would not print out "Hello" as the message for the assertion.
This had an underlying reason, in that it was trying to helpfully
keep the messages around in case of unexpected exceptions, so that
code like this:
```cpp
TEST_CASE() {
auto [input, expected] = GENERATE(...);
CAPTURE(input);
auto result = transform(input); // throws
REQUIRE(result == expected);
}
```
would report the value of `input` when `transform` throws. However,
it was surprising in practice and was causing various issues around
handling of messages in other cases.
Closes #1759
Closes #2019
Closes #2959