Get exit status of command substitution

Question

If I assign the output of a command substitution to a local variable, how do I get the exit status of the command?

This is the behaviour of ZSH 5.8:

false; echo $? # output is 1 as expected

foo=$(false); echo $? # output is 1 as expected

local foo=$(false); echo $? # output is 0

Answer 1

Split the declaration from the assignment:

local foo
foo=$(false)

(See also SC2155.)