Revert "feat: add functional version of nif for easier @generated"

This reverts commit e745e3f.

Author: MilesCranmer

src/Utils.jl

@@ -153,55 +153,4 @@ struct ResultOk2{A<:AbstractArray,B<:AbstractArray}
     ok::Bool
 end
 
-#! format: on
-"""
-    nif(condition, expression, [else_expression,] ::Val{N}) where {N}
-
-Generate a sequence of `if ... elseif ... else ... end` statements.
-This is copied from https://github.com/JuliaLang/julia/pull/55093.
-
-# Arguments
-- `condition`: A function that takes an integer between `1` and `N-1` and
-    returns a boolean condition.
-- `expression`: A function that takes an integer between `1` and `N` (or,
-    only up to `N-1`, if `else_expression` is provided) and is called if
-    the condition is true.
-- `else_expression`: (optional) A function that takes `N` as input
-    returns an expression to be evaluated if all conditions are false.
-- `N`: The number of conditions to check, passed as a `Val{N}` instance.
-This function is similar to the `@nif` macro but can be used in cases
-where `N` is not known at parse time.
-# Examples
-For example, here we find the first index of a positive element in a
-fixed-size tuple using `nif`:
-```jldoctest
-julia> x = (0, -1, 1, 0)
-(0, -1, 1, 0)
-julia> Base.Cartesian.nif(d -> x[d] > 0, d -> d, Val(4))
-3
-```
-"""
-@inline function nif(condition::F, expression::G, ::Val{N}) where {F,G,N}
-    return nif(condition, expression, expression, Val(N))
-end
-@inline function nif(
-    condition::F, expression::G, else_expression::H, ::Val{N}
-) where {F,G,H,N}
-    n = N::Int  # Can improve inference; see #54544
-    (n >= 0) || throw(ArgumentError("if statement length should be ≥ 0, got $n"))
-    if @generated
-        :(Base.Cartesian.@nif $N d -> condition(d) d -> expression(d) d ->
-            else_expression(d))
-    else
-        for d in 1:(n - 1)
-            if condition(d)
-                return expression(d)
-            end
-        end
-        return else_expression(n)
-    end
-end
-typeof(function nif end).name.max_methods = UInt8(2)
-#! format: off
-
 end

test/test_nif.jl

@@ -129,4 +129,3 @@ include("test_operator_construction_edgecases.jl")
 include("test_node_interface.jl")
 include("test_expression_math.jl")
 include("test_structured_expression.jl")
-include("test_nif.jl")