Definition:Can't Happen/Computer Science
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Definition
A branch of a program which, because of the way the flow is structured, cannot be accessed, is referred to as can't happen:
if (x == 1) then {
do.something (x)
} else if (x != 1) then {
do.somethingElse (x)
} else {
// can't happen
}
There are sometimes reasons for doing stuff like this, but professionals usually wince when they have to maintain it.