If a LogValue call panics, recover and return an error instead.
The error contains some stack information to make it easier to
find the problem. A number of people complained that panics
in fmt.Formatter.Format functions are hard to debug because
there is no context.
This is an example of the error text:
LogValue panicked
called from log/slog.panickingLogValue.LogValue (/usr/local/google/home/jba/repos/go/src/log/slog/value_test.go:221)
called from log/slog.Value.resolve (/usr/local/google/home/jba/repos/go/src/log/slog/value.go:465)
called from log/slog.Value.Resolve (/usr/local/google/home/jba/repos/go/src/log/slog/value.go:446)
called from log/slog.TestLogValue (/usr/local/google/home/jba/repos/go/src/log/slog/value_test.go:192)
called from testing.tRunner (/usr/local/google/home/jba/repos/go/src/testing/testing.go:1595)
(rest of stack elided)
Fixes #59141.
Change-Id: I62e6ff6968d1aa34873e955c2d606d25418a673b
Reviewed-on: https://go-review.googlesource.com/c/go/+/484097
TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>