| birthDay : Event | |
| birthDay = MkEvent "Happy BirthDay" [IntVar, StrCst " years old, ", StrVar] | |
| -- In the REPL: | |
| > logEvent birthDay [IntVal 32, StrVal "Quentin"] -- Values match the placeholder expected types | |
| Just "Happy BirthDay: 32 years old, Quentin" | |
| > logEvent birthDay [StrVal "Quentin", IntVal 32] -- Wrong placeholder types (inverted) | |
| Nothing | |
| > logEvent birthDay [IntVal 32] -- Missing placeholder value | |
| Nothing |
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