Segmentation fault when attempting to pass a tree instance as a function argument

[halabikeren]

Dear Hyphy Team,

I've encountered a difficulty in passing a tree instance to a function as an argument. When I try to do as stated, I receive a segmentation fault.

To reproduce the issue, please try:

`Tree T = ((a,b),(c,d),e); test(T);

function test(T) { fprintf(stdout, "tree passed: ", T, "\n"); }`

Is there any other way to pass a tree instance as an argument to a function?

Thanks! Keren

[ArtPoon]

Did you forget to enclose your Newick string in quotes?

Sent from my iPhone

On Aug 6, 2017, at 9:37 AM, halabikeren notifications@github.com wrote:

Dear Hyphy Team,

I've encountered a difficulty in passing a tree instance to a function as an argument. When I try to do as stated, I receive a segmentation fault.

To reproduce the issue, please try:

`Tree T = ((a,b),(c,d),e); test(T);

function test(T) { fprintf(stdout, "tree passed: ", T, "\n"); }`

Is there any other way to pass a tree instance as an argument to a function?

Thanks! Keren

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[halabikeren]

Thanks for the quick response!

Indeed, the segmentation fault no longer appear when I insert the newick content into quotes, as you suggested.

As far as I understand, using a newick format with no quotes should work as well (please see the code in #576 ). I wonder why there's a difference in the behavior.

[spond]

Dear Keren,

This seems to be an internal bugs, because the name of the variable you are trying to pass ('T') is the same as the name of the function argument.

Try

Tree T = ((a,b),(c,d),e);
fprintf (stdout, Type(test(T)), "\n");

function test (tree) {
    fprintf(stdout, "tree passed: ", tree, "\n");
    return tree;
}

Best, Sergei