2019Q1 - can't set "doc": var is read-only

[Dan Langille]

One of our in-house tcl applications is getting an error:

% set sec_comp [$test createComponent security #auto 1 2]
can't set "doc": var is read-only

In a test environment, I have narrowed it down to something between 2018Q4 and 2019Q1

The devs say "something changed" and an internal structure they used to write to can no longer be written to.

Does this ring any bells to folks?

I'm going to start updating pkgs one by one to see which one breaks it, but wanted feedkback in case this is a known issue.

My searches fail.

Thank you.

-- 
Dan Langille - BSDCan / PGCon
dan at langille.org