From c306f0616acc1ace6e890e3a9e18fd8c51673f52 Mon Sep 17 00:00:00 2001
From: Mason Protter <mason.protter@icloud.com>
Date: Mon, 22 Jan 2024 15:35:25 +0100
Subject: [PATCH] keep custom `isexpr`

---
 src/SumTypes.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/SumTypes.jl b/src/SumTypes.jl
index eab4fc2..cbe4559 100644
--- a/src/SumTypes.jl
+++ b/src/SumTypes.jl
@@ -3,7 +3,6 @@ module SumTypes
 export @sum_type, @cases, Uninit, full_type
 
 using MacroTools: MacroTools
-using Base: isexpr
 
 function constructors end
 function constructor end
@@ -14,6 +13,8 @@ is_sumtype(::Type{T}) where {T}   = false
 function get_tag end
 function tags end
 
+isexpr(x, head) = x isa Expr && x.head == head
+
 """
     isvariant(x::SumType, s::Symbol)