type context.valueCtx

4 uses

	context (current package)
		context.go#L529: 	return &valueCtx{parent, key, val}
		context.go#L534: type valueCtx struct {
		context.go#L552: func (c *valueCtx) String() string {
		context.go#L558: func (c *valueCtx) Value(key interface{}) interface{} {