From a29239085455964176ab0ad59b097da725813f6f Mon Sep 17 00:00:00 2001
From: Josh Stone <jistone@redhat.com>
Date: Thu, 5 Aug 2021 11:06:32 -0700
Subject: [PATCH] Only allow LLVM element_type on Array and Vector

---
 compiler/rustc_codegen_llvm/src/type_.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_codegen_llvm/src/type_.rs b/compiler/rustc_codegen_llvm/src/type_.rs
index 69787df5e07..52ae56b89b3 100644
--- a/compiler/rustc_codegen_llvm/src/type_.rs
+++ b/compiler/rustc_codegen_llvm/src/type_.rs
@@ -203,7 +203,11 @@ impl BaseTypeMethods<'tcx> for CodegenCx<'ll, 'tcx> {
     }
 
     fn element_type(&self, ty: &'ll Type) -> &'ll Type {
-        unsafe { llvm::LLVMGetElementType(ty) }
+        match self.type_kind(ty) {
+            TypeKind::Array | TypeKind::Vector => unsafe { llvm::LLVMGetElementType(ty) },
+            TypeKind::Pointer => bug!("element_type is not supported for opaque pointers"),
+            other => bug!("element_type called on unsupported type {:?}", other),
+        }
     }
 
     fn vector_length(&self, ty: &'ll Type) -> usize {