Re: Help needed: C++ compile error with nix 2.5.1

[Jakub Wilk <jwilk@jwilk.net>]

* Thomas Koch <thomas@koch.ro>, 2022-01-16, 11:23:
> https://github.com/NixOS/nix/issues/5923

The first bad commit is:
https://github.com/nlohmann/json/commit/0e694b4060ed55df

(This happens to be also the first bad commit for 
<https://github.com/nlohmann/json/issues/3204>, so I guess it's the same 
issue.)

I don't know what's going on here, but the attached patch seems to fix 
it.

--
Jakub Wilk

diff --git a/src/libstore/realisation.cc b/src/libstore/realisation.cc
index f871e6437..eb3ca0198 100644
--- a/src/libstore/realisation.cc
+++ b/src/libstore/realisation.cc
@@ -78,7 +78,7 @@ Realisation Realisation::fromJSON(
         auto fieldIterator = json.find(fieldName);
         if (fieldIterator == json.end())
             return std::nullopt;
-        return *fieldIterator;
+        return std::string(*fieldIterator);
     };
     auto getField = [&](std::string fieldName) -> std::string {
         if (auto field = getOptionalField(fieldName))