It repeatedly says that the aim is to fix errors. Assuming, however, that it is intended to give better error messages, here is the output of Clang on the input C program given as an example:

  $ cc gupta.c
  gupta.c:3:5: warning: incompatible redeclaration of library function 'pow'
      [-Wincompatible-library-redeclaration]
  int pow(int a, int b);
    ^
  gupta.c:3:5: note: 'pow' is a builtin with type 'double (double, double)'
  gupta.c:14:23: error: function definition is not allowed here
  int pow(int a, int b){
                      ^
  gupta.c:18:14: error: expected ';' at end of declaration
  return res;}
              ^
              ;
  gupta.c:18:14: error: expected '}'
  gupta.c:4:11: note: to match this '{'
  int main(){
            ^
  1 warning and 3 errors generated.

$ indent < gupta.c

/INDENT Error@18: Stuff missing from end of file */

A simple count of braces, { and }, would also have revealed the problem.