Grokbase › Groups › Go › golang-nuts › October 2014
FAQ
See http://play.golang.org/p/Dr3gVjctk6

It makes sense to me that printf requires multiple arguments, otherwise you
should just use print. However, I think this should throw a parse error
instead of panicking during Execute, so I just want to see if I'm missing
something before filing a bug report.

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  • Tomwilde at Oct 16, 2014 at 7:09 pm ⇧
    how would an error be thrown?

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  • Js at Oct 16, 2014 at 7:40 pm ⇧
    By testing for the scenario that is currently causing an Execute-time panic
    at Parse-time. Whatever the bug is, it's triggered when printf is called
    with no parameters in a pipeline. If you replace:

    "{{" | printf

    with:

    printf "{{"

    it runs without panicking. Calling:

    "{{" | print

    works fine as well, so it's not a problem for all functions.
    On Thursday, October 16, 2014 3:09:50 PM UTC-4, tomwilde wrote:

    how would an error be thrown?
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  • Js at Oct 16, 2014 at 7:46 pm ⇧
    This is a more illustrative example:

    http://play.golang.org/p/iKMQTtM3Vb
    On Thursday, October 16, 2014 3:39:59 PM UTC-4, Js wrote:

    By testing for the scenario that is currently causing an Execute-time
    panic at Parse-time. Whatever the bug is, it's triggered when printf is
    called with no parameters in a pipeline. If you replace:

    "{{" | printf

    with:

    printf "{{"

    it runs without panicking. Calling:

    "{{" | print

    works fine as well, so it's not a problem for all functions.
    On Thursday, October 16, 2014 3:09:50 PM UTC-4, tomwilde wrote:

    how would an error be thrown?
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  • Tomwilde at Oct 17, 2014 at 10:32 am ⇧

    On Thursday, October 16, 2014 9:39:59 PM UTC+2, Js wrote:
    If you replace:

    "{{" | printf

    with:

    printf "{{"

    it runs without panicking.
    That looks like a bug and you should report it.

    Detecting type-errors in templates is difficult, though. For a number of
    reasons.

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  • Js at Oct 17, 2014 at 12:37 pm ⇧
    Thanks

    https://code.google.com/p/go/issues/detail?id=8950
    On Friday, October 17, 2014 6:32:44 AM UTC-4, tomwilde wrote:
    On Thursday, October 16, 2014 9:39:59 PM UTC+2, Js wrote:

    If you replace:

    "{{" | printf

    with:

    printf "{{"

    it runs without panicking.
    That looks like a bug and you should report it.

    Detecting type-errors in templates is difficult, though. For a number of
    reasons.
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  • Rjeczalik at Oct 16, 2014 at 7:44 pm ⇧

    On 16 October 2014 21:09, tomwilde wrote:
    how would an error be thrown?
    template.Parse should return error saying that number of fixed arguments
    for printf is less than expected.

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postedOct 16, '14 at 6:02p
activeOct 17, '14 at 12:37p
posts7
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Js: 4 posts Tomwilde: 2 posts Rjeczalik: 1 post

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