Comment by tmtvl

I think most programming languages have syntactically significant whitespace. I believe Fortran doesn't (or didn't), which helped a bug fly under the radar at NASA:

  DO 10 I=1.10

Which got interpreted as:

  DO10I = 1.10

Whereas the programmer wanted:

  DO 10 I=1,10

For a DO loop. Conversely, with SSW a language will evaluate these two expressions differently:

  inta = 10;
  int a = 10;