Automated fix by @leftibot.

What changed

Fix #61: Comprehensive exception test suite and fix for silently swallowed exceptions
When all typed catch blocks failed to match a thrown exception's type,
handle_exception() would silently discard the exception and return a
default-constructed Boxed_Value instead of propagating it. This meant
code like try { throw(42) } catch(string e) { } would swallow the
int exception rather than letting it propagate to an outer handler.
The fix adds an explicit re-throw when no catch block matches, and
restructures eval_internal() with a nested try/catch to ensure the
finally block still executes before the unhandled exception propagates.
Co-Authored-By: Claude Opus 4.6 (1M context) [email protected]

Files

 include/chaiscript/language/chaiscript_eval.hpp |  34 +-
 unittests/compiled_tests.cpp                    | 188 ++++++
 unittests/exception_comprehensive.chai          | 862 ++++++++++++++++++++++++
 3 files changed, 1070 insertions(+), 14 deletions(-)

Closes #61

Triggered by @lefticus.