===== CASE: var sq = / 'foo'+ / =====



===== CASE: 
  var dq = / "foo"+ /
  echo $dq
   =====


    var dq = / "foo"+ /
               ^
[ -c flag ]:2: fatal: POSIX EREs don't have groups without capture, so this node needs () around it.
    $OIL -c "$@"
    ^~~~
test/oil-runtime-errors.sh:21: fatal: Exiting with status 1 (command in PID 6789)

===== CASE: echo hi; y = 2 + x + 3 =====


hi
  echo hi; y = 2 + x + 3
                   ^
[ -c flag ]:1: fatal: Undefined variable 'x'

===== CASE: if (x) { echo hello } =====


  if (x) { echo hello }
      ^
[ -c flag ]:1: fatal: Undefined variable 'x'

===== CASE: if ($x) { echo hi } =====


  if ($x) { echo hi }
      ^~
[ -c flag ]:1: fatal: Undefined variable 'x'

===== CASE: if (${x}) { echo hi } =====


  if (${x}) { echo hi }
        ^
[ -c flag ]:1: fatal: Undefined variable 'x'

===== CASE: x = / @undef /; echo hi =====


  x = / @undef /; echo hi
         ^~~~~
[ -c flag ]:1: fatal: Undefined variable 'undef'

===== CASE: var x = undef; echo $x =====


  var x = undef; echo $x
          ^~~~~
[ -c flag ]:1: fatal: Undefined variable 'undef'

===== CASE: setvar a = undef =====


  setvar a = undef
             ^~~~~
[ -c flag ]:1: fatal: Undefined variable 'undef'