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UndeclaredType

rascal-0.40.17

Synopsis​

Use of a type that has not been declared.

Description​

A type has to be declared before it can be used. This error is generated when an undeclared type is used.

Remedies:

  • Rename the type name.
  • Declare the type.
  • Import a module that declares the type. (Did you import all library modules?)

Examples​

Using the undeclared type myint gives an error:

rascal>myint incr(myint n) = n + 1;
|prompt:///|(0,5,<1,0>,<1,5>): Undeclared type: myint
Advice: |https://www.rascal-mpl.org/docs/Rascal/Errors/CompileTimeErrors/UndeclaredType|
ok

The solution is to first declare myint (here as an alias for int):

rascal>alias myint = int;
ok
rascal>myint incr(myint n) = n + 1;
int (int): function(|prompt:///|(0,28,<1,0>,<1,28>))
rascal>incr(3);
int: 4