# ! is parsed correctly into the fail attribute. It is output as an error, since
# the runner expects an error.
! command arg
---
Error: Command { name: "command", args: [Argument { key: None, value: "arg" }], prefix: None, tags: {}, silent: false, fail: true, line_number: 3 }

# Errors and panics are handled when ! is given.
! _error foo
---
Error: foo

! _panic foo
---
Panic: foo

# () can be used to silence the output.
(!_error foo)
(!_panic foo)
---
ok

# Prefixes can be used too.
a: ! _error foo
b:!_panic foo
---
a: Error: foo
b: Panic: foo