Introduced in 0.26.12
A variable or parameter shadows another one with the same name.
Sometimes shadowing can cause confusion. Especially, if the developer is new to F#, or to functional programming in general, she might have trouble differentiating it from mutation.
Rename varaible or parameter in question so it has unique name in its scope.
{
"disallowShadowing": {
"enabled": false
}
}