Parse error of function definition with here doc in command substitution

[D630]

Hi,

In version `5.2.0(1)-rc2 (x86_64-pc-linux-gnu)` from Debian, this code


```
_=$(
f1() {
c <<-!
!
}
f2() {
:
}
)
```

results in

```
bash: command substitution: line 15: syntax error near unexpected token 
`('

bash: command substitution: line 15: `}function f2 () '
```

This one looks good at first:

```
_=$(
f2() {
:
}
f1() {
c <<-!
!
}
)
```

But this not:

```
_=$(
f2() {
:
}
f1() {
c <<-!
!
}
f1
)
```

This works:

```
_=$(
f2() {
:
}
f1() {
c
} <<-!
!
f1
)
```

process substitution not correctly parsed inside variable expansion

[D630]

There is a parse error in B:

# A

bash$ p=; : "${p:=>(f()(echo "$@") ;f foo)}"; declare -p p
declare -- p=">(f()(echo ) ;f foo)"

bash$ p=; : ${p:=>(f()(echo "$@") ;f foo)}; declare -p p
declare -- p="/dev/fd/63"
foo

bash$ p=; echo "${p:=>(f()(echo "$@") ;f foo)}"

(f()(echo ) ;f foo)



# B

bash$ p=; : "${p:=>(f() { echo "$@"; };f foo)}"; declare -p p
declare -- p=">(f() { echo ; "

bash$ p=; : ${p:=>(f() { echo "$@"; };f foo)}; declare -p p
bash: syntax error near unexpected token `)'

bash$ p=; echo "${p:=>(f() { echo "$@"; };f foo)}"

(f() { echo ; ;f foo)}

arithmetic syntax error loop after declaration of exported integer variable

[D630]

I get an infinite error loop in B, and I suppose that's not because of 
my settings.


# A

bash$ unset -v foo; declare -i foo; foo='bar bar'
bash: bar bar: syntax error in expression (error token is "bar")

# B

bash$ unset -v foo; foo='bar bar' declare -x -i foo
[...]