Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL
-DHAVE_CONFIG_H -I. -I../. -I.././include -I.././lib
-Wdate-time -D_FORTIFY_SOURCE=2 -g -O2
-fdebug-prefix-map=/build/bash-7fckc0/bash-4.4=. -fstack-protector-strong
-Wformat -Werror=format-security -Wall -no-pie -Wno-parentheses
-Wno-format-security
uname output: Linux n227-006-177 4.14.81.bm.14-amd64 #1 SMP Debian
4.14.81.bm.14 Sun Aug 25 08:22:56 UTC 2019 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu
Bash Version: 4.4
Patch Level: 12
Release Status: release
Description:
A heredoc starts with "cat <<'EOF'" is expected to not expand anything
just like in a single quote string. But when this heredoc is in a $() or <(),
history is expanded.
Repeat-By:
This works:
```
cat <<'EOF'
!!
EOF
```
This doesn't work:
```
cat <(cat <<'EOF'
!!
EOF
)
```
This doesn't work neither:
```
echo "$(cat <<'EOF'
!!
EOF
)"
```
Only when I exec `set +H` to disable history expand, these examples all
work.
