From fc3ab03af74cb94a5ec94d84ec15650314f613eb Mon Sep 17 00:00:00 2001
From: Emil Lauridsen <mine809@gmail.com>
Date: Sun, 29 Dec 2019 17:38:37 +0100
Subject: Add helpers for unpacking lang items

---
 crates/ra_hir_def/src/lang_item.rs | 44 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/crates/ra_hir_def/src/lang_item.rs b/crates/ra_hir_def/src/lang_item.rs
index cef061837..37c861a87 100644
--- a/crates/ra_hir_def/src/lang_item.rs
+++ b/crates/ra_hir_def/src/lang_item.rs
@@ -22,6 +22,50 @@ pub enum LangItemTarget {
     TraitId(TraitId),
 }
 
+impl LangItemTarget {
+    pub fn as_enum(self) -> Option<EnumId> {
+        match self {
+            LangItemTarget::EnumId(id) => Some(id),
+            _ => None,
+        }
+    }
+
+    pub fn as_function(self) -> Option<FunctionId> {
+        match self {
+            LangItemTarget::FunctionId(id) => Some(id),
+            _ => None,
+        }
+    }
+
+    pub fn as_impl_block(self) -> Option<ImplId> {
+        match self {
+            LangItemTarget::ImplBlockId(id) => Some(id),
+            _ => None,
+        }
+    }
+
+    pub fn as_static(self) -> Option<StaticId> {
+        match self {
+            LangItemTarget::StaticId(id) => Some(id),
+            _ => None,
+        }
+    }
+
+    pub fn as_struct(self) -> Option<StructId> {
+        match self {
+            LangItemTarget::StructId(id) => Some(id),
+            _ => None,
+        }
+    }
+
+    pub fn as_trait(self) -> Option<TraitId> {
+        match self {
+            LangItemTarget::TraitId(id) => Some(id),
+            _ => None,
+        }
+    }
+}
+
 #[derive(Default, Debug, Clone, PartialEq, Eq)]
 pub struct LangItems {
     items: FxHashMap<SmolStr, LangItemTarget>,
-- 
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