I wrote a little function to set $slop for BOSL2 depending on which
printer I'm using.  I ran their slopTest.scad to find out what values to
use for each printer.  Normally the function would be included from my
library. I'm running with BOSL2 dated 3/30/22

Test code ==

include <BOSL2/std.scad> printer = "ender5"; // [ender5, tenlog, 10v3,
10S5] $slopspec =
[["ender5",.15],["tenlog",.15],["10S5",.04],["10v3",.14]]; function
get_slop(machine, i=0) =     assert(i < len($slopspec), str(machine, "
not recognized"))     ( machine == $slopspec[i][0]? $slopspec[i][1]:
        get_slop(machine,i+1)     ); echo("---Version---",version());
echo(printer=printer); $slop = get_slop(printer); echo($slop=$slop);

=== End code

If I run it as is, I get

WARNING: Ignoring unknown variable 'printer' in file testSlop.scad, line 14

TRACE: called by 'get_slop' in file testSlop.scad, line 14

If I comment out the include <BOSL2/std.scad>, it works!

If I change "printer" to "prtr", it works even with the include.

I grep'ed the BOSL2 library and the only places that "printer" appeared
are in comments

The same thing happens with OpenScad 2021.01 and the Nightly Build 2022
3 27.

--
Bob Ewart

More testing showed that changing "printer" to "prtr" does not work.

If I put the function above the include for BOSL2 it does work

I can't find 'get_slop' or 'slopspec' anywhere in BOSL2. 'machine' does
appear in two comments.

I guess I have a solution to my current  problem.  I just don't
understand why putting the BOSL2 includes first causes a variable to be
unrecognized.

--
Bob

Hi,

The error message is non-sense.

I was able to drill it down from

include <BOSL2/std.scad>

to

include <BOSL2/constants.scad>

Now I can narrow down the issue:

The variable $slop is already defined in constant.scad.

rename $slop to for e.g. $slop1 and it seams to work.

But that is a workaround, not a solution.

Minimum failing example for tonight:

main.scad:

include <include.scad>
printer = "ender5"; // [ender5, tenlog, 10v3, 10S5]

$slopspec = [["ender5",.15],["tenlog",.15],["10S5",.04],["10v3",.14]];
function get_slop(machine, i=0) =
    assert(i < len($slopspec), str(machine, " not recognized"))
    ( machine == $slopspec[i][0]? $slopspec[i][1]:
        get_slop(machine,i+1)
    );

echo("---Version---",version());
echo(printer=printer);

$slop = get_slop(printer);
echo($slop=$slop);

include.scad:

$slop = 1;

There is something really wrong...

I will try to simplify the failing example above.

Then I will open a github issue.

This will become a regression test.

with kind regards,

Michael Frey

It all comes back to the command line '-D var=val', which appends that assignment at the EOF.

From: nop head [mailto:nop.head@gmail.com]
Sent: Thu, 31 Mar 2022 10:31
To: OpenSCAD general discussion
Subject: [OpenSCAD] Re: Weird problem

Yes it is well known. bla has to have the same value throughout all the code and that value is the last assigned, which is findIT(fruit) but fruit is not defined where bla is first assigned.

On Wed, 30 Mar 2022 at 23:46, Leonard Martin Struttmann lenstruttmann@gmail.com wrote:

Hmmm, this fails even without using include.  Merely predining bla shows the issue:

bla = "bla";

fruit = "apple"; //[apple,jerry,lime,other]
$fruits = ["apple","jerry","lime"];

function findIT(toFind, i=0) = echo(i)
( i == len($fruits ) ? false : (toFind == $fruits[i]? $fruits[i]: known(toFind,i+1)) );

bla = findIT(fruit);

echo(bla);

Remove the bla = "bla"; and it works.

On Wed, Mar 30, 2022 at 3:32 PM Michael Frey michael.frey@gmx.ch wrote:

On 30.03.22 22:05, nop head wrote:

It is a well known feature of OpenSCAD.

If you define a variable twice it moves the assignments RHS to the site of the first definition and printer is then not in scope.

with all due respect, but this looks like a bug:

inc-test.scad:

bla  = "bla";

main.scad:

include <inc-test.scad> fruit = "apple"; //[apple,jerry,lime,other] $fruits = ["apple","jerry","lime"]; function known(toFind, i=0) =    ( i == len($fruits ) ? false : (toFind == $fruits[i]? $fruits[i]:          known(toFind,i+1))    );      bla = known(fruit); echo(bla);

bla from the include should get overwritten with apple.

The warnings are a mess and the output incorrect:

WARNING: Ignoring unknown variable 'fruit' in file function-overwrites-variable.scad, line 10

WARNING: Ignoring unknown variable '$fruits' in file function-overwrites-variable.scad, line 6

WARNING: len() parameter could not be converted: argument 0: expected string, found undefined in file function-overwrites-variable.scad, line 6

WARNING: Ignoring unknown variable '$fruits' in file function-overwrites-variable.scad, line 6

WARNING: Ignoring unknown variable '$fruits' in file function-overwrites-variable.scad, line 6

ECHO: undef

This looks like a bug to me.

From what I tested, it is the interaction of include and function that is causing this.

With kind regards,

Michael Frey

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