20 files changed, 210 insertions, 174 deletions

diff --git a/doc/manual/command-ref/nix-channel.xml b/doc/manual/command-ref/nix-channel.xml
index 9fea59167..ebcf56aff 100644
--- a/doc/manual/command-ref/nix-channel.xml
+++ b/doc/manual/command-ref/nix-channel.xml
@@ -36,6 +36,9 @@ stay up-to-date with a set of pre-built Nix expressions.  A Nix
 channel is just a URL that points to a place containing a set of Nix
 expressions.  <phrase condition="manual">See also <xref
 linkend="sec-channels" />.</phrase></para>
+      
+<para>To see the list of official NixOS channels, visit <link
+xlink:href="https://nixos.org/channels" />.</para>
 
 <para>This command has the following operations:
 
diff --git a/doc/manual/packages/channels.xml b/doc/manual/packages/channels.xml
index 15c119fcb..1ed2bba52 100644
--- a/doc/manual/packages/channels.xml
+++ b/doc/manual/packages/channels.xml
@@ -17,6 +17,9 @@ a set of Nix expressions and a manifest.  Using the command <link
 linkend="sec-nix-channel"><command>nix-channel</command></link> you
 can automatically stay up to date with whatever is available at that
 URL.</para>
+      
+<para>To see the list of official NixOS channels, visit <link
+xlink:href="https://nixos.org/channels" />.</para>
 
 <para>You can “subscribe” to a channel using
 <command>nix-channel --add</command>, e.g.,
diff --git a/doc/manual/release-notes/rl-2.3.xml b/doc/manual/release-notes/rl-2.3.xml
index 80fbd6396..0ad7d641f 100644
--- a/doc/manual/release-notes/rl-2.3.xml
+++ b/doc/manual/release-notes/rl-2.3.xml
@@ -33,9 +33,13 @@ incompatible changes:</para>
   </listitem>
 
   <listitem>
-    <para>The installer now enables sandboxing by default on
-    Linux. The <literal>max-jobs</literal> setting now defaults to
-    1.</para>
+    <para>The installer now enables sandboxing by default on Linux when the
+    system has the necessary kernel support.
+    </para>
+  </listitem>
+
+  <listitem>
+    <para>The <literal>max-jobs</literal> setting now defaults to 1.</para>
   </listitem>
 
   <listitem>
@@ -82,11 +86,6 @@ incompatible changes:</para>
     the duration of Nix function calls to stderr.</para>
   </listitem>
 
-  <listitem>
-    <para>On Linux, sandboxing is now disabled by default on systems
-    that don’t have the necessary kernel support.</para>
-  </listitem>
-
 </itemizedlist>
 
 </section>
diff --git a/flake.nix b/flake.nix
index 96823a997..2dcdc28fa 100644
--- a/flake.nix
+++ b/flake.nix
@@ -354,6 +354,8 @@
             name = "nix-build";
             src = self.hydraJobs.tarball;
 
+            enableParallelBuilding = true;
+
             buildInputs = buildDeps;
 
             dontInstall = false;
@@ -366,6 +368,9 @@
             # syntax-check generated dot files, it still requires some
             # fonts.  So provide those.
             FONTCONFIG_FILE = texFunctions.fontsConf;
+
+            # To test building without precompiled headers.
+            makeFlagsArray = [ "PRECOMPILE_HEADERS=0" ];
           };
 
         # System tests.
diff --git a/shell.nix b/shell.nix
index c709f6a5f..e5a2b2c91 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,6 @@
 { useClang ? false }:
 
-with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/bb1013511e1e5edcf314df8321acf2f3c536df0d.tar.gz) {};
+with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/nixos-19.09.tar.gz) {};
 
 with import ./release-common.nix { inherit pkgs; };
 
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 427a6f299..852e8aa11 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -566,9 +566,9 @@ LocalNoInlineNoReturn(void throwTypeError(const char * s, const ExprLambda & fun
     throw TypeError(format(s) % fun.showNamePos() % s2 % pos);
 }
 
-LocalNoInlineNoReturn(void throwAssertionError(const char * s, const Pos & pos))
+LocalNoInlineNoReturn(void throwAssertionError(const char * s, const string & s1, const Pos & pos))
 {
-    throw AssertionError(format(s) % pos);
+    throw AssertionError(format(s) % s1 % pos);
 }
 
 LocalNoInlineNoReturn(void throwUndefinedVarError(const char * s, const string & s1, const Pos & pos))
@@ -1302,8 +1302,11 @@ void ExprIf::eval(EvalState & state, Env & env, Value & v)
 
 void ExprAssert::eval(EvalState & state, Env & env, Value & v)
 {
-    if (!state.evalBool(env, cond, pos))
-        throwAssertionError("assertion failed at %1%", pos);
+    if (!state.evalBool(env, cond, pos)) {
+        std::ostringstream out;
+        cond->show(out);
+        throwAssertionError("assertion '%1%' failed at %2%", out.str(), pos);
+    }
     body->eval(state, env, v);
 }
 
diff --git a/src/libexpr/json-to-value.cc b/src/libexpr/json-to-value.cc
index 8bae986f9..1fdce1983 100644
--- a/src/libexpr/json-to-value.cc
+++ b/src/libexpr/json-to-value.cc
@@ -1,149 +1,161 @@
 #include "json-to-value.hh"
 
-#include <cstring>
+#include <variant>
+#include <nlohmann/json.hpp>
 
-namespace nix {
+using json = nlohmann::json;
+using std::unique_ptr;
 
+namespace nix {
 
-static void skipWhitespace(const char * & s)
-{
-    while (*s == ' ' || *s == '\t' || *s == '\n' || *s == '\r') s++;
-}
+// for more information, refer to
+// https://github.com/nlohmann/json/blob/master/include/nlohmann/detail/input/json_sax.hpp
+class JSONSax : nlohmann::json_sax<json> {
+    class JSONState {
+    protected:
+        unique_ptr<JSONState> parent;
+        Value * v;
+    public:
+        virtual unique_ptr<JSONState> resolve(EvalState &)
+        {
+            throw std::logic_error("tried to close toplevel json parser state");
+        };
+        explicit JSONState(unique_ptr<JSONState>&& p) : parent(std::move(p)), v(nullptr) {};
+        explicit JSONState(Value* v) : v(v) {};
+        JSONState(JSONState& p) = delete;
+        Value& value(EvalState & state)
+        {
+            if (v == nullptr)
+                v = state.allocValue();
+            return *v;
+        };
+        virtual ~JSONState() {};
+        virtual void add() {};
+    };
+
+    class JSONObjectState : public JSONState {
+        using JSONState::JSONState;
+        ValueMap attrs = ValueMap();
+        virtual unique_ptr<JSONState> resolve(EvalState & state) override
+        {
+            Value& v = parent->value(state);
+            state.mkAttrs(v, attrs.size());
+            for (auto & i : attrs)
+                v.attrs->push_back(Attr(i.first, i.second));
+            return std::move(parent);
+        }
+        virtual void add() override { v = nullptr; };
+    public:
+        void key(string_t& name, EvalState & state)
+        {
+            attrs[state.symbols.create(name)] = &value(state);
+        }
+    };
+
+    class JSONListState : public JSONState {
+        ValueVector values = ValueVector();
+        virtual unique_ptr<JSONState> resolve(EvalState & state) override
+        {
+            Value& v = parent->value(state);
+            state.mkList(v, values.size());
+            for (size_t n = 0; n < values.size(); ++n) {
+                v.listElems()[n] = values[n];
+            }
+            return std::move(parent);
+        }
+        virtual void add() override {
+            values.push_back(v);
+            v = nullptr;
+        };
+    public:
+        JSONListState(unique_ptr<JSONState>&& p, std::size_t reserve) : JSONState(std::move(p))
+        {
+            values.reserve(reserve);
+        }
+    };
 
+    EvalState & state;
+    unique_ptr<JSONState> rs;
 
-static string parseJSONString(const char * & s)
-{
-    string res;
-    if (*s++ != '"') throw JSONParseError("expected JSON string");
-    while (*s != '"') {
-        if (!*s) throw JSONParseError("got end-of-string in JSON string");
-        if (*s == '\\') {
-            s++;
-            if (*s == '"') res += '"';
-            else if (*s == '\\') res += '\\';
-            else if (*s == '/') res += '/';
-            else if (*s == '/') res += '/';
-            else if (*s == 'b') res += '\b';
-            else if (*s == 'f') res += '\f';
-            else if (*s == 'n') res += '\n';
-            else if (*s == 'r') res += '\r';
-            else if (*s == 't') res += '\t';
-            else if (*s == 'u') throw JSONParseError("\\u characters in JSON strings are currently not supported");
-            else throw JSONParseError("invalid escaped character in JSON string");
-            s++;
-        } else
-            res += *s++;
+    template<typename T, typename... Args> inline bool handle_value(T f, Args... args)
+    {
+        f(rs->value(state), args...);
+        rs->add();
+        return true;
     }
-    s++;
-    return res;
-}
 
+public:
+    JSONSax(EvalState & state, Value & v) : state(state), rs(new JSONState(&v)) {};
 
-static void parseJSON(EvalState & state, const char * & s, Value & v)
-{
-    skipWhitespace(s);
-
-    if (!*s) throw JSONParseError("expected JSON value");
-
-    if (*s == '[') {
-        s++;
-        ValueVector values;
-        values.reserve(128);
-        skipWhitespace(s);
-        while (1) {
-            if (values.empty() && *s == ']') break;
-            Value * v2 = state.allocValue();
-            parseJSON(state, s, *v2);
-            values.push_back(v2);
-            skipWhitespace(s);
-            if (*s == ']') break;
-            if (*s != ',') throw JSONParseError("expected ',' or ']' after JSON array element");
-            s++;
-        }
-        s++;
-        state.mkList(v, values.size());
-        for (size_t n = 0; n < values.size(); ++n)
-            v.listElems()[n] = values[n];
+    bool null()
+    {
+        return handle_value(mkNull);
     }
 
-    else if (*s == '{') {
-        s++;
-        ValueMap attrs;
-        while (1) {
-            skipWhitespace(s);
-            if (attrs.empty() && *s == '}') break;
-            string name = parseJSONString(s);
-            skipWhitespace(s);
-            if (*s != ':') throw JSONParseError("expected ':' in JSON object");
-            s++;
-            Value * v2 = state.allocValue();
-            parseJSON(state, s, *v2);
-            attrs[state.symbols.create(name)] = v2;
-            skipWhitespace(s);
-            if (*s == '}') break;
-            if (*s != ',') throw JSONParseError("expected ',' or '}' after JSON member");
-            s++;
-        }
-        state.mkAttrs(v, attrs.size());
-        for (auto & i : attrs)
-            v.attrs->push_back(Attr(i.first, i.second));
-        v.attrs->sort();
-        s++;
+    bool boolean(bool val)
+    {
+        return handle_value(mkBool, val);
     }
 
-    else if (*s == '"') {
-        mkString(v, parseJSONString(s));
+    bool number_integer(number_integer_t val)
+    {
+        return handle_value(mkInt, val);
     }
 
-    else if (isdigit(*s) || *s == '-' || *s == '.' ) {
-        // Buffer into a string first, then use built-in C++ conversions
-        std::string tmp_number;
-        ValueType number_type = tInt;
+    bool number_unsigned(number_unsigned_t val)
+    {
+        return handle_value(mkInt, val);
+    }
 
-        while (isdigit(*s) || *s == '-' || *s == '.' || *s == 'e' || *s == 'E') {
-            if (*s == '.' || *s == 'e' || *s == 'E')
-                number_type = tFloat;
-            tmp_number += *s++;
-        }
+    bool number_float(number_float_t val, const string_t& s)
+    {
+        return handle_value(mkFloat, val);
+    }
 
-        try {
-            if (number_type == tFloat)
-                mkFloat(v, stod(tmp_number));
-            else
-                mkInt(v, stol(tmp_number));
-        } catch (std::invalid_argument & e) {
-            throw JSONParseError("invalid JSON number");
-        } catch (std::out_of_range & e) {
-            throw JSONParseError("out-of-range JSON number");
-        }
+    bool string(string_t& val)
+    {
+        return handle_value<void(Value&, const char*)>(mkString, val.c_str());
     }
 
-    else if (strncmp(s, "true", 4) == 0) {
-        s += 4;
-        mkBool(v, true);
+    bool start_object(std::size_t len)
+    {
+        rs = std::make_unique<JSONObjectState>(std::move(rs));
+        return true;
     }
 
-    else if (strncmp(s, "false", 5) == 0) {
-        s += 5;
-        mkBool(v, false);
+    bool key(string_t& name)
+    {
+        dynamic_cast<JSONObjectState*>(rs.get())->key(name, state);
+        return true;
     }
 
-    else if (strncmp(s, "null", 4) == 0) {
-        s += 4;
-        mkNull(v);
+    bool end_object() {
+        rs = rs->resolve(state);
+        rs->add();
+        return true;
     }
 
-    else throw JSONParseError("unrecognised JSON value");
-}
+    bool end_array() {
+        return end_object();
+    }
 
+    bool start_array(size_t len) {
+        rs = std::make_unique<JSONListState>(std::move(rs),
+            len != std::numeric_limits<size_t>::max() ? len : 128);
+        return true;
+    }
+
+    bool parse_error(std::size_t, const std::string&, const nlohmann::detail::exception& ex) {
+        throw JSONParseError(ex.what());
+    }
+};
 
 void parseJSON(EvalState & state, const string & s_, Value & v)
 {
-    const char * s = s_.c_str();
-    parseJSON(state, s, v);
-    skipWhitespace(s);
-    if (*s) throw JSONParseError(format("expected end-of-string while parsing JSON value: %1%") % s);
+    JSONSax parser(state, v);
+    bool res = json::sax_parse(s_, &parser);
+    if (!res)
+        throw JSONParseError("Invalid JSON Value");
 }
 
-
 }
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 2df9277c9..af6c91954 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -732,6 +732,8 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
            the hash. */
         for (auto & i : outputs) {
             if (!jsonObject) drv.env[i] = "";
+            drv.outputs.insert_or_assign(i,
+                DerivationOutput(StorePath::dummy.clone(), "", ""));
         }
 
         Hash h = hashDerivationModulo(*state.store, Derivation(drv), true);
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index f1085cae1..4137c47e5 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1017,7 +1017,7 @@ DerivationGoal::DerivationGoal(StorePath && drvPath, const StringSet & wantedOut
     , buildMode(buildMode)
 {
     state = &DerivationGoal::getDerivation;
-    name = fmt("building of '%s'", worker.store.printStorePath(drvPath));
+    name = fmt("building of '%s'", worker.store.printStorePath(this->drvPath));
     trace("created");
 
     mcExpectedBuilds = std::make_unique<MaintainCount<uint64_t>>(worker.expectedBuilds);
@@ -1042,7 +1042,7 @@ DerivationGoal::DerivationGoal(StorePath && drvPath, const BasicDerivation & drv
 
     /* Prevent the .chroot directory from being
        garbage-collected. (See isActiveTempFile() in gc.cc.) */
-    worker.store.addTempRoot(drvPath);
+    worker.store.addTempRoot(this->drvPath);
 }
 
 
@@ -3341,7 +3341,7 @@ void DerivationGoal::runChild()
             ;
         }
 #if __APPLE__
-        else if (getEnv("_NIX_TEST_NO_SANDBOX") == "") {
+        else {
             /* This has to appear before import statements. */
             std::string sandboxProfile = "(version 1)\n";
 
@@ -3450,25 +3450,31 @@ void DerivationGoal::runChild()
             /* They don't like trailing slashes on subpath directives */
             if (globalTmpDir.back() == '/') globalTmpDir.pop_back();
 
-            builder = "/usr/bin/sandbox-exec";
-            args.push_back("sandbox-exec");
-            args.push_back("-f");
-            args.push_back(sandboxFile);
-            args.push_back("-D");
-            args.push_back("_GLOBAL_TMP_DIR=" + globalTmpDir);
-            args.push_back("-D");
-            args.push_back("IMPORT_DIR=" + settings.nixDataDir + "/nix/sandbox/");
-            if (allowLocalNetworking) {
+            if (getEnv("_NIX_TEST_NO_SANDBOX") != "1") {
+                builder = "/usr/bin/sandbox-exec";
+                args.push_back("sandbox-exec");
+                args.push_back("-f");
+                args.push_back(sandboxFile);
                 args.push_back("-D");
-                args.push_back(string("_ALLOW_LOCAL_NETWORKING=1"));
+                args.push_back("_GLOBAL_TMP_DIR=" + globalTmpDir);
+                args.push_back("-D");
+                args.push_back("IMPORT_DIR=" + settings.nixDataDir + "/nix/sandbox/");
+                if (allowLocalNetworking) {
+                    args.push_back("-D");
+                    args.push_back(string("_ALLOW_LOCAL_NETWORKING=1"));
+                }
+                args.push_back(drv->builder);
+            } else {
+                builder = drv->builder.c_str();
+                args.push_back(std::string(baseNameOf(drv->builder)));
             }
-            args.push_back(drv->builder);
         }
-#endif
+#else
         else {
             builder = drv->builder.c_str();
             args.push_back(std::string(baseNameOf(drv->builder)));
         }
+#endif
 
         for (auto & i : drv->args)
             args.push_back(rewriteStrings(i, inputRewrites));
@@ -4253,7 +4259,7 @@ SubstitutionGoal::SubstitutionGoal(StorePath && storePath, Worker & worker, Repa
     , repair(repair)
 {
     state = &SubstitutionGoal::init;
-    name = fmt("substitution of '%s'", worker.store.printStorePath(storePath));
+    name = fmt("substitution of '%s'", worker.store.printStorePath(this->storePath));
     trace("created");
     maintainExpectedSubstitutions = std::make_unique<MaintainCount<uint64_t>>(worker.expectedSubstitutions);
 }
diff --git a/src/libstore/derivations.cc b/src/libstore/derivations.cc
index 1a061149a..d9da8769c 100644
--- a/src/libstore/derivations.cc
+++ b/src/libstore/derivations.cc
@@ -246,30 +246,18 @@ string Derivation::unparse(const Store & store, bool maskOutputs,
     s.reserve(65536);
     s += "Derive([";
 
-    StringSet maskedOutputs;
-
-    if (maskOutputs) {
-        bool first = true;
-        maskedOutputs = tokenizeString<StringSet>(get(env, "outputs").value_or("out"), " ");
-        for (auto & i : maskedOutputs) {
-            if (first) first = false; else s += ',';
-            s += '('; printString(s, i);
-            s += ",\"\",\"\",\"\")";
-        }
-    } else {
-        bool first = true;
-        for (auto & i : outputs) {
-            if (first) first = false; else s += ',';
-            s += '('; printString(s, i.first);
-            s += ','; printString(s, store.printStorePath(i.second.path));
-            s += ','; printString(s, i.second.hashAlgo);
-            s += ','; printString(s, i.second.hash);
-            s += ')';
-        }
+    bool first = true;
+    for (auto & i : outputs) {
+        if (first) first = false; else s += ',';
+        s += '('; printString(s, i.first);
+        s += ','; printString(s, maskOutputs ? "" : store.printStorePath(i.second.path));
+        s += ','; printString(s, i.second.hashAlgo);
+        s += ','; printString(s, i.second.hash);
+        s += ')';
     }
 
     s += "],[";
-    bool first = true;
+    first = true;
     if (actualInputs) {
         for (auto & i : *actualInputs) {
             if (first) first = false; else s += ',';
@@ -299,7 +287,7 @@ string Derivation::unparse(const Store & store, bool maskOutputs,
     for (auto & i : env) {
         if (first) first = false; else s += ',';
         s += '('; printString(s, i.first);
-        s += ','; printString(s, maskOutputs && maskedOutputs.count(i.first) ? "" : i.second);
+        s += ','; printString(s, maskOutputs && outputs.count(i.first) ? "" : i.second);
         s += ')';
     }
 
diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index ed81186af..690febc5b 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -443,7 +443,7 @@ void LocalStore::findRuntimeRoots(Roots & roots, bool censor)
     // lsof is really slow on OS X. This actually causes the gc-concurrent.sh test to fail.
     // See: https://github.com/NixOS/nix/issues/3011
     // Because of this we disable lsof when running the tests.
-    if (getEnv("_NIX_TEST_NO_LSOF") == "") {
+    if (getEnv("_NIX_TEST_NO_LSOF") != "1") {
         try {
             std::regex lsofRegex(R"(^n(/.*)$)");
             auto lsofLines =
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index 5f1ae5ab5..a8945996e 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -7,6 +7,7 @@
 #include <map>
 #include <thread>
 #include <dlfcn.h>
+#include <sys/utsname.h>
 
 
 namespace nix {
diff --git a/src/libstore/nar-info.cc b/src/libstore/nar-info.cc
index fb02cf3fd..1375094b5 100644
--- a/src/libstore/nar-info.cc
+++ b/src/libstore/nar-info.cc
@@ -4,7 +4,7 @@
 namespace nix {
 
 NarInfo::NarInfo(const Store & store, const std::string & s, const std::string & whence)
-    : ValidPathInfo(StorePath::make((unsigned char *) "xxxxxxxxxxxxxxxxxxxx", "x")) // FIXME: hack
+    : ValidPathInfo(StorePath::dummy.clone()) // FIXME: hack
 {
     auto corrupt = [&]() {
         throw Error(format("NAR info file '%1%' is corrupt") % whence);
diff --git a/src/libstore/path.cc b/src/libstore/path.cc
index cda5f9968..a33bec3ed 100644
--- a/src/libstore/path.cc
+++ b/src/libstore/path.cc
@@ -46,12 +46,15 @@ std::string_view StorePath::name() const
     return ffi_StorePath_name(*this);
 }
 
+StorePath StorePath::dummy(
+    StorePath::make(
+        (unsigned char *) "xxxxxxxxxxxxxxxxxxxx", "x"));
+
 StorePath Store::parseStorePath(std::string_view path) const
 {
     return StorePath::make(path, storeDir);
 }
 
-
 StorePathSet Store::parseStorePathSet(const PathSet & paths) const
 {
     StorePathSet res;
diff --git a/src/libstore/path.hh b/src/libstore/path.hh
index 5ebb57480..6b29c3566 100644
--- a/src/libstore/path.hh
+++ b/src/libstore/path.hh
@@ -53,6 +53,8 @@ struct StorePath : rust::Value<3 * sizeof(void *) + 24, ffi_StorePath_drop>
     {
         return ffi_StorePath_hash_data(*this);
     }
+
+    static StorePath dummy;
 };
 
 typedef std::set<StorePath> StorePathSet;
diff --git a/src/nix-prefetch-url/nix-prefetch-url.cc b/src/nix-prefetch-url/nix-prefetch-url.cc
index 2ec0b07ac..cc0891811 100644
--- a/src/nix-prefetch-url/nix-prefetch-url.cc
+++ b/src/nix-prefetch-url/nix-prefetch-url.cc
@@ -53,7 +53,7 @@ static int _main(int argc, char * * argv)
     {
         HashType ht = htSHA256;
         std::vector<string> args;
-        bool printPath = getEnv("PRINT_PATH") != "";
+        bool printPath = getEnv("PRINT_PATH") == "1";
         bool fromExpr = false;
         string attrPath;
         bool unpack = false;
diff --git a/tests/lang/eval-okay-fromjson-escapes.exp b/tests/lang/eval-okay-fromjson-escapes.exp
new file mode 100644
index 000000000..add5505a8
--- /dev/null
+++ b/tests/lang/eval-okay-fromjson-escapes.exp
@@ -0,0 +1 @@
+"quote \" reverse solidus \\ solidus / backspace  formfeed  newline \n carriage return \r horizontal tab \t 1 char unicode encoded backspace  1 char unicode encoded e with accent é 2 char unicode encoded s with caron š 3 char unicode encoded rightwards arrow →"
diff --git a/tests/lang/eval-okay-fromjson-escapes.nix b/tests/lang/eval-okay-fromjson-escapes.nix
new file mode 100644
index 000000000..f00713507
--- /dev/null
+++ b/tests/lang/eval-okay-fromjson-escapes.nix
@@ -0,0 +1,3 @@
+# This string contains all supported escapes in a JSON string, per json.org
+# \b and \f are not supported by Nix
+builtins.fromJSON ''"quote \" reverse solidus \\ solidus \/ backspace \b formfeed \f newline \n carriage return \r horizontal tab \t 1 char unicode encoded backspace \u0008 1 char unicode encoded e with accent \u00e9 2 char unicode encoded s with caron \u0161 3 char unicode encoded rightwards arrow \u2192"''
diff --git a/tests/structured-attrs.nix b/tests/structured-attrs.nix
index 6c77a4391..c39c3a346 100644
--- a/tests/structured-attrs.nix
+++ b/tests/structured-attrs.nix
@@ -16,6 +16,8 @@ mkDerivation {
 
   __structuredAttrs = true;
 
+  outputs = [ "out" "dev" ];
+
   buildCommand = ''
     set -x
 
@@ -30,8 +32,9 @@ mkDerivation {
     [[ -v nothing ]]
     [[ -z $nothing ]]
 
-    mkdir ''${outputs[out]}
+    mkdir ''${outputs[out]} ''${outputs[dev]}
     echo bar > $dest
+    echo foo > $dest2
 
     json=$(cat .attrs.json)
     [[ $json =~ '"narHash":"sha256:1r7yc43zqnzl5b0als5vnyp649gk17i37s7mj00xr8kc47rjcybk"' ]]
@@ -57,6 +60,7 @@ mkDerivation {
   nothing = null;
 
   dest = "${placeholder "out"}/foo";
+  dest2 = "${placeholder "dev"}/foo";
 
   "foo bar" = "BAD";
   "1foobar" = "BAD";
diff --git a/tests/structured-attrs.sh b/tests/structured-attrs.sh
index 9ba2672b6..646bdb876 100644
--- a/tests/structured-attrs.sh
+++ b/tests/structured-attrs.sh
@@ -2,6 +2,7 @@ source common.sh
 
 clearStore
 
-outPath=$(nix-build structured-attrs.nix --no-out-link)
+nix-build structured-attrs.nix -A all -o $TEST_ROOT/result
 
-[[ $(cat $outPath/foo) = bar ]]
+[[ $(cat $TEST_ROOT/result/foo) = bar ]]
+[[ $(cat $TEST_ROOT/result-dev/foo) = foo ]]