Concatenated stream elements can't be accessed multiple times

[joao-silveira]

When accessing the elements of a concatenated stream, the concatenated elements are missing when accessing the stream a second time. In any case the elements passed in the stream(...) call are always available.

Langium version: 3.0.0 Package name: Langium

Code example:

const countTest = stream([1]).concat([2])
countTest.count()
countTest.toArray() // returns [ 1 ] but expected was [1, 2]

const toStringTest = stream([1]).concat([2])
toStringTest.toString()
toStringTest.toArray() // returns [ 1 ] but expected was [1 , 2]

const findTest = stream([1]).concat([2])
findTest.some((it: number) => it === 2) //returns true
findTest.some((it: number) => it === 2) //returns false but expected was true

This problem really seems to be specific to streams concatenations because i tried other variants of the code above with stream([1], [2]) or stream([1], stream([2])) and all of those work.

[msujew]

Thanks for catching, see https://github.com/eclipse-langium/langium/pull/1545 for a fix.