From 99200d3bfbb614e1e1c7dc7aab322aa659fd8b4c Mon Sep 17 00:00:00 2001
From: ridiculousfish <corydoras@ridiculousfish.com>
Date: Fri, 23 Feb 2018 21:28:36 -0800
Subject: [PATCH] Attempt to fix the Linux Travis build

---
 src/maybe.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/maybe.h b/src/maybe.h
index e4c1fc20c..73939471c 100644
--- a/src/maybe.h
+++ b/src/maybe.h
@@ -39,6 +39,13 @@ class maybe_t {
     // Construct a maybe_t from a value T.
     /* implicit */ maybe_t(const T &v) : filled(true) { new (storage) T(v); }
 
+    // Copy constructor.
+    maybe_t(const maybe_t &v) {
+        if (v.filled) {
+            new (storage) T(v.value());
+        }
+    }
+
     // Move constructor.
     /* implicit */ maybe_t(maybe_t &&v) {
         if (v.filled) {