build.dir/destroot.dir quirkiness

[Jeremy Lavergne]

While the Guide says these default to ${worksrcpath}, I just saw that  
they are only set to the initial value of that variable and not they  
were overridden as.  I have to do the following to get the expected  
results:

# this isn't saved into build or destroot.dir
set worksrcpath ${worksrcpath}/src
...
# reassigning
build.dir ${worksrcpath}
...
# reassinging
destroot.dir ${worksrcpath}

Is this expected behavior?
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