Wrongly-closed parenthesis produces a useless compile error

[jamshark70]

// OK version
/fmt = "\delta("@", 0.5, 0, 1, 4, 3)::\shuf("1,,2,,3,,4,,5,,6,,7,,", "@")::\stuttPitch(, 100, 0.25, 1, 1000, "2345", ".", "@")";

// wrong version
/fmt = "\delta("@", 0.5, 0, 1, 4, 3)::\shuf("1,,2,,3,,4,,5,,6,,7,,"), "@")::\stuttPitch(, 100, 0.25, 1, 1000, "2345", ".", "@")";

The "@") after shuf should print a bracket-mismatch error. Instead:

ERROR: syntax error, unexpected BINOP, expecting $end
  in interpreted text
  line 1 char 1:

  @")::\stuttPitch(, 100, 0.25, 1, 1000, "2345", ".", "@")"; 

... which looks like a cll parsing bug, but it's really wrong input.

For user friendliness during performance, better to identify this case and give meaningful feedback.