Assignments to FUNCNAME break FUNCNAME

[Arfrever Frehtes Taifersar Arahesis]

Manual of BASH claims:
"Assignments to FUNCNAME have no effect and return an error status."

However assignments to FUNCNAME actually break FUNCNAME.
I use BASH 4.3.30.


Variant with "local":

$ A() { echo A; declare -p FUNCNAME; local FUNCNAME=(); }
$ B() { echo B; declare -p FUNCNAME; }
$ A
A
declare -a FUNCNAME='([0]="A")'
bash: FUNCNAME: variable may not be assigned value
$ A
A
declare -a FUNCNAME='([0]="A" [1]="A")'
bash: FUNCNAME: variable may not be assigned value
$ A
A
declare -a FUNCNAME='([0]="A" [1]="A" [2]="A")'
bash: FUNCNAME: variable may not be assigned value
$ B
B
declare -a FUNCNAME='([0]="B" [1]="A" [2]="A" [3]="A")'
$ A
A
declare -a FUNCNAME='([0]="A" [1]="A" [2]="A" [3]="A")'
bash: FUNCNAME: variable may not be assigned value
$ B
B
declare -a FUNCNAME='([0]="B" [1]="A" [2]="A" [3]="A" [4]="A")'
$ 


Variant without "local":

$ A() { echo A; declare -p FUNCNAME; FUNCNAME=(); }
$ B() { echo B; declare -p FUNCNAME; }
$ A
A
declare -a FUNCNAME='([0]="A")'
$ A
A
declare -a FUNCNAME='([0]="A" [1]="A")'
$ A
A
declare -a FUNCNAME='([0]="A" [1]="A" [2]="A")'
$ B
B
declare -a FUNCNAME='([0]="B" [1]="A" [2]="A" [3]="A")'
$ A
A
declare -a FUNCNAME='([0]="A" [1]="A" [2]="A" [3]="A")'
$ B
B
declare -a FUNCNAME='([0]="B" [1]="A" [2]="A" [3]="A" [4]="A")'
$ 


Also is it intentional that code after attempt of assignment to FUNCNAME is not 
run?
The sentence in manual could be interpreted as simply setting $? to non-zero 
value and still running subsequent code.

$ A() { echo A; local FUNCNAME=(); echo AAA; }   
$ A
A
bash: FUNCNAME: variable may not be assigned value
$

--
Arfrever Frehtes Taifersar Arahesis

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