21: Add solutions for section "macros".

Dependencies

• [2] H6XH45OP 0

Change contents

• edit in exercises/macros/macros4.rs at line 3
  [2.124215]→[2.124215:124233](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/macros/macros4.rs at line 7
  [2.124311]→[2.124311:124317](∅→∅)
  − }
  [2.124311]

  [2.124317]
  + };
• replacement in exercises/macros/macros4.rs at line 10
  [2.124394]→[2.124394:124400](∅→∅)
  − }
  [2.124394]

  [2.124400]
  + };
• edit in exercises/macros/macros3.rs at line 4
  [2.124619]→[2.124619:124637](∅→∅)
  −

  − // I AM NOT DONE
• edit in exercises/macros/macros3.rs at line 6
  [2.124651]

  [2.124651]
  + #[macro_export]
• edit in exercises/macros/macros2.rs at line 3
  [2.124908]→[2.124908:124958](∅→∅)
  −

  − // I AM NOT DONE

  −

  − fn main() {

  − my_macro!();

  − }
• edit in exercises/macros/macros2.rs at line 9
  [2.125045]
  +

  + fn main() {

  + my_macro!();

  + }
• edit in exercises/macros/macros1.rs at line 3
  [2.125162]→[2.125162:125180](∅→∅)
  −

  − // I AM NOT DONE
• replacement in exercises/macros/macros1.rs at line 11
  [2.125280]→[2.125280:125296](∅→∅)
  − my_macro();
  [2.125280]

  [2.125296]
  + my_macro!();