Bug Report: `export $(dbus-launch)` cannot be parsed by bunster

[liveqte]

Bug Report: export $(dbus-launch) cannot be parsed by bunster

Problem Description
When using the valid shell syntax export $(dbus-launch) inside a script, bunster fails to parse it and throws a syntax error:

a_wrap.sh(2:12): syntax error: unexpected token $(.
Minimal Reproduction Example

8a88b64bbd99:/tmp/bunster$ cat a_wrap.sh 
{
    export $(dbus-launch)
}
8a88b64bbd99:/tmp/bunster$ bunster build 'a_wrap.sh' -o 'w2bun'
a_wrap.sh(2:12): syntax error: unexpected token `$(`.

Expected Behavior

bunster should correctly handle the $(...)

command substitution syntax and compile the script without errors. In standard bash/sh environments, export $(dbus-launch) is valid and executable.

Environment Information

bunster version: bunster version v0.14.0

OS: Alpine Linux

Go version: go1.24.7 linux/amd64

Additional Notes

The $(...) command substitution is part of the POSIX standard and is equivalent to using backticks. It should be supported by bunster’s parser.