From 1366501d60908bda30cd0abf1f26b2c839494b86 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 8 Mar 2026 17:39:29 +0000
Subject: [PATCH 1/3] Initial plan


From 247822ac93f2073ad3542f7ea45658b54cab4058 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 8 Mar 2026 17:57:23 +0000
Subject: [PATCH 2/3] Conditionally use Base.JuliaSyntax on newer Julia
 versions

Co-authored-by: ericphanson <5846501+ericphanson@users.noreply.github.com>
---
 src/ExplicitImports.jl | 16 +++++++++++++---
 test/runtests.jl       | 10 ++++++++++
 2 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/src/ExplicitImports.jl b/src/ExplicitImports.jl
index f533fad..b8ba232 100644
--- a/src/ExplicitImports.jl
+++ b/src/ExplicitImports.jl
@@ -1,20 +1,30 @@
 module ExplicitImports
 
+const BASE_JULIASYNTAX_VERSION = v"1.12.0-DEV.0"
+const USE_BASE_JULIASYNTAX = VERSION >= BASE_JULIASYNTAX_VERSION
+
 #! explicit-imports: off
 # We vendor some dependencies to avoid compatibility problems. We tell ExplicitImports to ignore
 # these as we don't want it to recurse into vendored dependencies.
 # We also add `Vendored` to `ignore_submodules` elsewhere.
 module Vendored
-include(joinpath("vendored", "JuliaSyntax", "src", "JuliaSyntax.jl"))
+if VERSION < v"1.12.0-DEV.0"
+    include(joinpath("vendored", "JuliaSyntax", "src", "JuliaSyntax.jl"))
+end
 include(joinpath("vendored", "AbstractTrees", "src", "AbstractTrees.jl"))
 end
 #! explicit-imports: on
 
-using .Vendored.JuliaSyntax
+if USE_BASE_JULIASYNTAX
+    import Base: JuliaSyntax
+else
+    import .Vendored: JuliaSyntax
+end
+using .JuliaSyntax
 # suppress warning about Base.parse collision, even though parse is never used
 # this avoids a warning when loading the package while creating an unused explicit import
 # the former occurs for all users, the latter only for developers of this package
-using .Vendored.JuliaSyntax: parse
+using .JuliaSyntax: parse
 
 using .Vendored.AbstractTrees
 using .Vendored.AbstractTrees: parent
diff --git a/test/runtests.jl b/test/runtests.jl
index 5b26716..0c67a8e 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1286,6 +1286,16 @@ include("issue_140.jl")
         end
     end
 
+    @testset "JuliaSyntax backend selection" begin
+        if VERSION >= ExplicitImports.BASE_JULIASYNTAX_VERSION
+            @test ExplicitImports.JuliaSyntax === Base.JuliaSyntax
+            @test !isdefined(ExplicitImports.Vendored, :JuliaSyntax)
+        else
+            @test isdefined(ExplicitImports.Vendored, :JuliaSyntax)
+            @test ExplicitImports.JuliaSyntax === ExplicitImports.Vendored.JuliaSyntax
+        end
+    end
+
     @testset "backtick modules and locations" begin
         @testset "print_explicit_imports" begin
             # Test that module names and file:line locations are surrounded by backticks

From d22731bc9beb0367fabbb62b72b8429eaa155246 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 8 Mar 2026 18:00:00 +0000
Subject: [PATCH 3/3] Refine JuliaSyntax backend condition to reuse shared
 constant

Co-authored-by: ericphanson <5846501+ericphanson@users.noreply.github.com>
---
 src/ExplicitImports.jl | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/ExplicitImports.jl b/src/ExplicitImports.jl
index b8ba232..f99899b 100644
--- a/src/ExplicitImports.jl
+++ b/src/ExplicitImports.jl
@@ -8,7 +8,8 @@ const USE_BASE_JULIASYNTAX = VERSION >= BASE_JULIASYNTAX_VERSION
 # these as we don't want it to recurse into vendored dependencies.
 # We also add `Vendored` to `ignore_submodules` elsewhere.
 module Vendored
-if VERSION < v"1.12.0-DEV.0"
+using ..ExplicitImports: USE_BASE_JULIASYNTAX
+if !USE_BASE_JULIASYNTAX
     include(joinpath("vendored", "JuliaSyntax", "src", "JuliaSyntax.jl"))
 end
 include(joinpath("vendored", "AbstractTrees", "src", "AbstractTrees.jl"))