TCL – How to read a nested variable from inside a procedure

I am trying to do the following:

set myvar_key something
set a myvar
proc test {} {
  # I am expecting mylocal_var to be "something", but it errors
  set mylocal_var [set ${::a}_key]
}

# The proc is called like this
test

Thanks in advance,
Pedro

>Solution :

You’re almost there, but just missed something. As your code already shows, a is in the global namespace, thus you need ::a.
Same is true for myvar_key, thus you need to do

set myvar_key something
set a myvar
proc test {} {
  set mylocal_var [set ::${::a}_key]
  puts $mylocal_var
}
test

prints "something"