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MissingReturn

rascal-0.40.17

Synopsis​

A return statement is missing from a function body.

Description​

Functions return some value (except functions that have return type void). This error is generated when a function body does not return a value.

Remedies:

  • Add a [Rascal:Return] statement to the function body.
  • Rewrite the function so that the function body becomes a single expression and you can use the abbreviated function format, see Function

Examples​

Here is an incorrect definition of function triple:

rascal>int triple(int x) {
>>>>>>>   x * 3;
>>>>>>>}
int (int): function(|prompt:///|(0,31,<1,0>,<3,1>))
rascal>triple(5)
|prompt:///|(0,31,<1,0>,<3,1>): Missing return statement
Advice: |https://www.rascal-mpl.org/docs/Rascal/Errors/CompileTimeErrors/MissingReturn|
ok

It should look like this:

rascal>int triple(int x) {
>>>>>>>   return x * 3;
>>>>>>>}
int (int): function(|prompt:///|(0,38,<1,0>,<3,1>))
rascal>triple(5)
int: 15

This is another solution using the abbreviated function format:

rascal>int triple(int x) = x * 3;
int (int): function(|prompt:///|(0,26,<1,0>,<1,26>))
rascal>triple(5)
int: 15