testing: example test panic kills entire program

[rsc]

A panic during an example test kills the entire test binary.
It should probably be caught and reported, the same way that an ordinary test does.

[adg]

Comment 1:

Surprising! Investigating.

[adg]

Comment 2:

This change makes examples behave the same as tests:
https://golang.org/cl/7148043
Note that tests that panic kill the test binary, too. The panic is re-thrown inside
tRunner:
        defer func() {
                t.duration = time.Now().Sub(t.start)
                // If the test panicked, print any test output before dying.
                if err := recover(); err != nil {
                        t.report()
                        panic(err)
                }
                t.signal <- t
        }()
The CL above makes examples do the same thing. Effectively, the one thing you get from
this is a "FAIL: ExampleFoo" line above the panic.

[adg]

Comment 3:

Status changed to Started.

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Comment 4:

This issue was closed by revision 5bd5ed2.

Status changed to Fixed.