Exception#cause

exception.cause → an_exception or nil

static VALUE
exc_cause(VALUE exc)
{
    return rb_attr_get(exc, id_cause);
}

Returns the previous exception ($!) at the time this exception was raised. This is useful for wrapping exceptions and retaining the original exception information.

See also #backtrace_locations #detailed_message #backtrace #exception also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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