Chaining another range after a filtered input range omits the first element.
Minimal example:
import std.stdio;
import std.algorithm;
import std.range;
void main(){
int i = 0;
int gen(){
return i++;
}
auto r1 = generate!gen.until!(x=> x>10);
auto r2 = only(100);
// Will print [7.8,9,10,100]
// 6 is missing
r1.filter!"a>5".chain(r2).writeln;
// By adding "array" before chain, it will behave properly
// [6,7,8,9,10,100]
// r1.array.filter!"a>5".chain(r2).writeln;
// r1.filter!"a>5".array.chain(r2).writeln;
}
>dmd --version
DMD64 D Compiler v2.109.1
Copyright (C) 1999-2024 by The D Language Foundation, All Rights Reserved written by Walter Bright
os: linux x64
