RUNTIME ERROR: Couldn't manifest function in JSON output. about go-jsonnet HOT 10 CLOSED

You probably have a function buried in those objects somewhere. The stacktrace should help you locate it, if not, that's a bug in itself.

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Hello @PureWhiteWu,

The result of this program is a function (@sparkprime: it's not buried, the whole thing is a function). When you execute this file jsonnet wants to print the result - but it can't print functions.

If you intended this file to be a library, the idiomatic way is to wrap it in an object:

{
    my_func_name(config={}):: 
        local ....
}

You can also run the function with an argument directly from commandline using top level arguments, ex.
jsonnet --tla-code 'config={config_param: 42} your_file.jsonnet

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If it's a function and it can be executed without arguments, you don't need to give top level arguments

dcunnin@dcunnin7:~$ jsonnet -e 'function(config={})config'
{ }

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Oh, so there is a difference between Go and C++ versions. In Go it still tries to manifest this function. The C++ behavior makes more sense probably. So we gotta fix it, I guess.

For now the workaround is to provide at least one argument, through --tla-str/--tla-code.

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@sbarzowski thanks very much! Can you notify me when this is fixed?
I'm not quite familiar with compilation principle so maybe not able to send prs...

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Ah I remember us discussing this but I didn't realise there was a divergence. Also we should have a test for this case in the test_cmd suite.

dcunnin@casterly:~$ go-workspace/bin/jsonnet -e 'function(config={})config'
RUNTIME ERROR: Couldn't manifest function in JSON output.
        During manifestation

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Test is here: google/jsonnet#428

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@PureWhiteWu It is fixed on master now.

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@sbarzowski okay, thanks! I will try it!

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It works fine! thanks!

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