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Re:About V, the language Volt is written in by milancurcic on Thursday February 07, 2019 @01:15AM (#19103407)
Pure functions in Fortran do this.
Re:About V, the language Volt is written in by petre on Thursday February 07, 2019 @02:49AM (#19103720)
Also D with the immutable type qualifier.

https://dlang.org/spec/function.html#pure-functions