From 06de99ef626fd15b8147328a716c9a1ffb1fc712 Mon Sep 17 00:00:00 2001
From: Valentin Churavy <vchuravy@users.noreply.github.com>
Date: Thu, 2 Nov 2023 04:44:49 -0400
Subject: [PATCH] Make Scope immutable (#51976)

Addresses keno review comment in
https://github.com/JuliaLang/julia/pull/50958#discussion_r1378513975
---
 base/scopedvalues.jl | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/base/scopedvalues.jl b/base/scopedvalues.jl
index 4c46809e75ffe..94491294c798a 100644
--- a/base/scopedvalues.jl
+++ b/base/scopedvalues.jl
@@ -56,7 +56,7 @@ Base.isassigned(val::ScopedValue) = val.has_default
 
 const ScopeStorage = Base.PersistentDict{ScopedValue, Any}
 
-mutable struct Scope
+struct Scope
     values::ScopeStorage
 end
 
@@ -114,15 +114,15 @@ function get(val::ScopedValue{T}) where {T}
     # Inline current_scope to avoid doing the type assertion twice.
     scope = current_task().scope
     if scope === nothing
-        isassigned(val) && return Some(val.default)
+        isassigned(val) && return Some{T}(val.default)
         return nothing
     end
     scope = scope::Scope
     if isassigned(val)
-        return Some(Base.get(scope.values, val, val.default)::T)
+        return Some{T}(Base.get(scope.values, val, val.default)::T)
     else
         v = Base.get(scope.values, val, novalue)
-        v === novalue || return Some(v::T)
+        v === novalue || return Some{T}(v::T)
     end
     return nothing
 end