commit 8d98c809a229b360e71ae5c3340be214f9039ab9
Author: Ian Cottrell <iancottrell@google.com>
Date:   Wed Jul 10 21:11:23 2019 -0400

    internal/lsp: stop making background contexts everywhere
    
    For all uses inside the lsp we use the detatch logic instead
    For tests we build it in the test harness instead
    This is in preparation for things on the context becomming important
    
    Change-Id: I7e6910e0d3581b82abbeeb09f9c22a99efb73142
    Reviewed-on: https://go-review.googlesource.com/c/tools/+/185677
    Run-TryBot: Ian Cottrell <iancottrell@google.com>
    Reviewed-by: Rebecca Stambler <rstambler@golang.org>

diff --git a/internal/xcontext/xcontext.go b/internal/xcontext/xcontext.go
new file mode 100644
index 0000000..b5c82f7
--- /dev/null
+++ b/internal/xcontext/xcontext.go
@@ -0,0 +1,23 @@
+// Copyright 2019 The Go MCP SDK Authors. All rights reserved.
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+// Package xcontext is a package to offer the extra functionality we need
+// from contexts that is not available from the standard context package.
+package xcontext
+
+import (
+	"context"
+	"time"
+)
+
+// Detach returns a context that keeps all the values of its parent context
+// but detaches from the cancellation and error handling.
+func Detach(ctx context.Context) context.Context { return detachedContext{ctx} }
+
+type detachedContext struct{ parent context.Context }
+
+func (v detachedContext) Deadline() (time.Time, bool)       { return time.Time{}, false }
+func (v detachedContext) Done() <-chan struct{}             { return nil }
+func (v detachedContext) Err() error                        { return nil }
+func (v detachedContext) Value(key interface{}) interface{} { return v.parent.Value(key) }