Use proper quotes everywhere

10 files changed, 78 insertions, 78 deletions

diff --git a/src/libexpr/attr-path.cc b/src/libexpr/attr-path.cc
index 4f28a549f035..fdd61a5fd375 100644
--- a/src/libexpr/attr-path.cc
+++ b/src/libexpr/attr-path.cc
@@ -19,7 +19,7 @@ static Strings parseAttrPath(const string & s)
             ++i;
             while (1) {
                 if (i == s.end())
-                    throw Error(format("missing closing quote in selection path `%1%'") % s);
+                    throw Error(format("missing closing quote in selection path ‘%1%’") % s);
                 if (*i == '"') break;
                 cur.push_back(*i++);
             }
@@ -38,7 +38,7 @@ Value * findAlongAttrPath(EvalState & state, const string & attrPath,
     Strings tokens = parseAttrPath(attrPath);
 
     Error attrError =
-        Error(format("attribute selection path `%1%' does not match expression") % attrPath);
+        Error(format("attribute selection path ‘%1%’ does not match expression") % attrPath);
 
     Value * v = &vIn;
 
@@ -63,15 +63,15 @@ Value * findAlongAttrPath(EvalState & state, const string & attrPath,
 
             if (v->type != tAttrs)
                 throw TypeError(
-                    format("the expression selected by the selection path `%1%' should be a set but is %2%")
+                    format("the expression selected by the selection path ‘%1%’ should be a set but is %2%")
                     % attrPath % showType(*v));
 
             if (attr.empty())
-                throw Error(format("empty attribute name in selection path `%1%'") % attrPath);
+                throw Error(format("empty attribute name in selection path ‘%1%’") % attrPath);
 
             Bindings::iterator a = v->attrs->find(state.symbols.create(attr));
             if (a == v->attrs->end())
-                throw Error(format("attribute `%1%' in selection path `%2%' not found") % attr % attrPath);
+                throw Error(format("attribute ‘%1%’ in selection path ‘%2%’ not found") % attr % attrPath);
             v = &*a->value;
         }
 
@@ -79,11 +79,11 @@ Value * findAlongAttrPath(EvalState & state, const string & attrPath,
 
             if (v->type != tList)
                 throw TypeError(
-                    format("the expression selected by the selection path `%1%' should be a list but is %2%")
+                    format("the expression selected by the selection path ‘%1%’ should be a list but is %2%")
                     % attrPath % showType(*v));
 
             if (attrIndex >= v->list.length)
-                throw Error(format("list index %1% in selection path `%2%' is out of range") % attrIndex % attrPath);
+                throw Error(format("list index %1% in selection path ‘%2%’ is out of range") % attrIndex % attrPath);
 
             v = v->list.elems[attrIndex];
         }
diff --git a/src/libexpr/common-opts.cc b/src/libexpr/common-opts.cc
index 2e8bb29c7dc2..25f1e7117b76 100644
--- a/src/libexpr/common-opts.cc
+++ b/src/libexpr/common-opts.cc
@@ -12,7 +12,7 @@ bool parseAutoArgs(Strings::iterator & i,
     string arg = *i;
     if (arg != "--arg" && arg != "--argstr") return false;
 
-    UsageError error(format("`%1%' requires two arguments") % arg);
+    UsageError error(format("‘%1%’ requires two arguments") % arg);
 
     if (++i == argsEnd) throw error;
     string name = *i;
@@ -43,7 +43,7 @@ bool parseSearchPathArg(Strings::iterator & i,
     const Strings::iterator & argsEnd, Strings & searchPath)
 {
     if (*i != "-I") return false;
-    if (++i == argsEnd) throw UsageError("`-I' requires an argument");
+    if (++i == argsEnd) throw UsageError("‘-I’ requires an argument");
     searchPath.push_back(*i);
     return true;
 }
diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index b752e1c75622..5cb6fc3cfe7b 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -396,7 +396,7 @@ inline Value * EvalState::lookupVar(Env * env, const ExprVar & var, bool noEval)
             return j->value;
         }
         if (!env->prevWith)
-            throwUndefinedVarError("undefined variable `%1%' at %2%", var.name, var.pos);
+            throwUndefinedVarError("undefined variable ‘%1%’ at %2%", var.name, var.pos);
         for (unsigned int l = env->prevWith; l; --l, env = env->up) ;
     }
 }
@@ -537,12 +537,12 @@ void EvalState::evalFile(const Path & path, Value & v)
         return;
     }
 
-    startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path2);
+    startNest(nest, lvlTalkative, format("evaluating file ‘%1%’") % path2);
     Expr * e = parseExprFromFile(path2);
     try {
         eval(e, v);
     } catch (Error & e) {
-        addErrorPrefix(e, "while evaluating the file `%1%':\n", path2);
+        addErrorPrefix(e, "while evaluating the file ‘%1%’:\n", path2);
         throw;
     }
 
@@ -686,7 +686,7 @@ void ExprAttrs::eval(EvalState & state, Env & env, Value & v)
         Symbol nameSym = state.symbols.create(nameVal.string.s);
         Bindings::iterator j = v.attrs->find(nameSym);
         if (j != v.attrs->end())
-            throwEvalError("dynamic attribute `%1%' at %2% already defined at %3%", nameSym, i->pos, *j->pos);
+            throwEvalError("dynamic attribute ‘%1%’ at %2% already defined at %3%", nameSym, i->pos, *j->pos);
 
         i->valueExpr->setName(nameSym);
         /* Keep sorted order so find can catch duplicates */
@@ -764,7 +764,7 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
                     staticPath.push_back(AttrName(getName(*j, state, env)));
                     for (j = j + 1; j != attrPath.end(); ++j)
                         staticPath.push_back(*j);
-                    throwEvalError("attribute `%1%' missing, at %2%", showAttrPath(staticPath), pos);
+                    throwEvalError("attribute ‘%1%’ missing, at %2%", showAttrPath(staticPath), pos);
                 }
             }
             vAttrs = j->value;
@@ -776,7 +776,7 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
 
     } catch (Error & e) {
         if (pos2 && pos2->file != state.sDerivationNix)
-            addErrorPrefix(e, "while evaluating the attribute `%1%' at %2%:\n",
+            addErrorPrefix(e, "while evaluating the attribute ‘%1%’ at %2%:\n",
                 showAttrPath(attrPath), *pos2);
         throw;
     }
@@ -900,7 +900,7 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & po
         foreach (Formals::Formals_::iterator, i, lambda.formals->formals) {
             Bindings::iterator j = arg.attrs->find(i->name);
             if (j == arg.attrs->end()) {
-                if (!i->def) throwTypeError("%1% called without required argument `%2%', at %3%",
+                if (!i->def) throwTypeError("%1% called without required argument ‘%2%’, at %3%",
                     lambda, i->name, pos);
                 env2.values[displ++] = i->def->maybeThunk(*this, env2);
             } else {
@@ -916,7 +916,7 @@ void EvalState::callFunction(Value & fun, Value & arg, Value & v, const Pos & po
                user. */
             foreach (Bindings::iterator, i, *arg.attrs)
                 if (lambda.formals->argNames.find(i->name) == lambda.formals->argNames.end())
-                    throwTypeError("%1% called with unexpected argument `%2%', at %3%", lambda, i->name, pos);
+                    throwTypeError("%1% called with unexpected argument ‘%2%’, at %3%", lambda, i->name, pos);
             abort(); // can't happen
         }
     }
@@ -963,7 +963,7 @@ void EvalState::autoCallFunction(Bindings & args, Value & fun, Value & res)
         if (j != args.end())
             actualArgs->attrs->push_back(*j);
         else if (!i->def)
-            throwTypeError("cannot auto-call a function that has an argument without a default value (`%1%')", i->name);
+            throwTypeError("cannot auto-call a function that has an argument without a default value (‘%1%’)", i->name);
     }
 
     actualArgs->attrs->sort();
@@ -1233,10 +1233,10 @@ string EvalState::forceStringNoCtx(Value & v, const Pos & pos)
     string s = forceString(v, pos);
     if (v.string.context) {
         if (pos)
-            throwEvalError("the string `%1%' is not allowed to refer to a store path (such as `%2%'), at %3%",
+            throwEvalError("the string ‘%1%’ is not allowed to refer to a store path (such as ‘%2%’), at %3%",
                 v.string.s, v.string.context[0], pos);
         else
-            throwEvalError("the string `%1%' is not allowed to refer to a store path (such as `%2%')",
+            throwEvalError("the string ‘%1%’ is not allowed to refer to a store path (such as ‘%2%’)",
                 v.string.s, v.string.context[0]);
     }
     return s;
@@ -1307,7 +1307,7 @@ string EvalState::coerceToString(const Pos & pos, Value & v, PathSet & context,
 string EvalState::copyPathToStore(PathSet & context, const Path & path)
 {
     if (nix::isDerivation(path))
-        throwEvalError("file names are not allowed to end in `%1%'", drvExtension);
+        throwEvalError("file names are not allowed to end in ‘%1%’", drvExtension);
 
     Path dstPath;
     if (srcToStore[path] != "")
@@ -1317,7 +1317,7 @@ string EvalState::copyPathToStore(PathSet & context, const Path & path)
             ? computeStorePathForPath(path).first
             : store->addToStore(path, true, htSHA256, defaultPathFilter, repair);
         srcToStore[path] = dstPath;
-        printMsg(lvlChatty, format("copied source `%1%' -> `%2%'")
+        printMsg(lvlChatty, format("copied source ‘%1%’ -> ‘%2%’")
             % path % dstPath);
     }
 
@@ -1330,7 +1330,7 @@ Path EvalState::coerceToPath(const Pos & pos, Value & v, PathSet & context)
 {
     string path = coerceToString(pos, v, context, false, false);
     if (path == "" || path[0] != '/')
-        throwEvalError("string `%1%' doesn't represent an absolute path, at %1%", path, pos);
+        throwEvalError("string ‘%1%’ doesn't represent an absolute path, at %1%", path, pos);
     return path;
 }
 
diff --git a/src/libexpr/get-drvs.cc b/src/libexpr/get-drvs.cc
index 57b87ab58d41..db91eab37156 100644
--- a/src/libexpr/get-drvs.cc
+++ b/src/libexpr/get-drvs.cc
@@ -259,7 +259,7 @@ static void getDerivations(EvalState & state, Value & vIn,
             attrs.insert(std::pair<string, Symbol>(i->name, i->name));
 
         foreach (SortedSymbols::iterator, i, attrs) {
-            startNest(nest, lvlDebug, format("evaluating attribute `%1%'") % i->first);
+            startNest(nest, lvlDebug, format("evaluating attribute ‘%1%’") % i->first);
             string pathPrefix2 = addToPath(pathPrefix, i->first);
             Value & v2(*v.attrs->find(i->second)->value);
             if (combineChannels)
diff --git a/src/libexpr/json-to-value.cc b/src/libexpr/json-to-value.cc
index 7f60e7cc6356..af4394b0bbba 100644
--- a/src/libexpr/json-to-value.cc
+++ b/src/libexpr/json-to-value.cc
@@ -65,7 +65,7 @@ static void parseJSON(EvalState & state, const char * & s, Value & v)
             values.push_back(v2);
             skipWhitespace(s);
             if (*s == ']') break;
-            if (*s != ',') throw JSONParseError("expected `,' or `]' after JSON array element");
+            if (*s != ',') throw JSONParseError("expected ‘,’ or ‘]’ after JSON array element");
             s++;
         }
         s++;
@@ -82,14 +82,14 @@ static void parseJSON(EvalState & state, const char * & s, Value & v)
             if (v.attrs->empty() && *s == '}') break;
             string name = parseJSONString(s);
             skipWhitespace(s);
-            if (*s != ':') throw JSONParseError("expected `:' in JSON object");
+            if (*s != ':') throw JSONParseError("expected ‘:’ in JSON object");
             s++;
             Value * v2 = state.allocValue();
             parseJSON(state, s, *v2);
             v.attrs->push_back(Attr(state.symbols.create(name), v2));
             skipWhitespace(s);
             if (*s == '}') break;
-            if (*s != ',') throw JSONParseError("expected `,' or `}' after JSON member");
+            if (*s != ',') throw JSONParseError("expected ‘,’ or ‘}’ after JSON member");
             s++;
         }
         v.attrs->sort();
diff --git a/src/libexpr/lexer.l b/src/libexpr/lexer.l
index 911850cc5ba5..82520ee7a59a 100644
--- a/src/libexpr/lexer.l
+++ b/src/libexpr/lexer.l
@@ -113,7 +113,7 @@ or          { return OR_KW; }
 {INT}       { errno = 0;
               yylval->n = strtol(yytext, 0, 10);
               if (errno != 0)
-                  throw ParseError(format("invalid integer `%1%'") % yytext);
+                  throw ParseError(format("invalid integer ‘%1%’") % yytext);
               return INT;
             }
 
diff --git a/src/libexpr/nixexpr.cc b/src/libexpr/nixexpr.cc
index bb72c007cbcd..c8521718b82a 100644
--- a/src/libexpr/nixexpr.cc
+++ b/src/libexpr/nixexpr.cc
@@ -212,7 +212,7 @@ void ExprVar::bindVars(const StaticEnv & env)
     /* Otherwise, the variable must be obtained from the nearest
        enclosing `with'.  If there is no `with', then we can issue an
        "undefined variable" error now. */
-    if (withLevel == -1) throw UndefinedVarError(format("undefined variable `%1%' at %2%") % name % pos);
+    if (withLevel == -1) throw UndefinedVarError(format("undefined variable ‘%1%’ at %2%") % name % pos);
 
     fromWith = true;
     this->level = withLevel;
@@ -364,7 +364,7 @@ void ExprLambda::setName(Symbol & name)
 
 string ExprLambda::showNamePos() const
 {
-    return (format("%1% at %2%") % (name.set() ? "`" + (string) name + "'" : "anonymous function") % pos).str();
+    return (format("%1% at %2%") % (name.set() ? "‘" + (string) name + "’" : "anonymous function") % pos).str();
 }
 
 
diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh
index 9c631d093bf0..2619a7026fca 100644
--- a/src/libexpr/nixexpr.hh
+++ b/src/libexpr/nixexpr.hh
@@ -224,7 +224,7 @@ struct ExprLambda : Expr
         : pos(pos), arg(arg), matchAttrs(matchAttrs), formals(formals), body(body)
     {
         if (!arg.empty() && formals && formals->argNames.find(arg) != formals->argNames.end())
-            throw ParseError(format("duplicate formal function argument `%1%' at %2%")
+            throw ParseError(format("duplicate formal function argument ‘%1%’ at %2%")
                 % arg % pos);
     };
     void setName(Symbol & name);
diff --git a/src/libexpr/parser.y b/src/libexpr/parser.y
index a19269b33cc5..60a87ca94e10 100644
--- a/src/libexpr/parser.y
+++ b/src/libexpr/parser.y
@@ -67,14 +67,14 @@ namespace nix {
 
 static void dupAttr(const AttrPath & attrPath, const Pos & pos, const Pos & prevPos)
 {
-    throw ParseError(format("attribute `%1%' at %2% already defined at %3%")
+    throw ParseError(format("attribute ‘%1%’ at %2% already defined at %3%")
         % showAttrPath(attrPath) % pos % prevPos);
 }
 
 
 static void dupAttr(Symbol attr, const Pos & pos, const Pos & prevPos)
 {
-    throw ParseError(format("attribute `%1%' at %2% already defined at %3%")
+    throw ParseError(format("attribute ‘%1%’ at %2% already defined at %3%")
         % attr % pos % prevPos);
 }
 
@@ -123,7 +123,7 @@ static void addAttr(ExprAttrs * attrs, AttrPath & attrPath,
 static void addFormal(const Pos & pos, Formals * formals, const Formal & formal)
 {
     if (formals->argNames.find(formal.name) != formals->argNames.end())
-        throw ParseError(format("duplicate formal function argument `%1%' at %2%")
+        throw ParseError(format("duplicate formal function argument ‘%1%’ at %2%")
             % formal.name % pos);
     formals->formals.push_front(formal);
     formals->argNames.insert(formal.name);
@@ -570,7 +570,7 @@ Path resolveExprPath(Path path)
     struct stat st;
     while (true) {
         if (lstat(path.c_str(), &st))
-            throw SysError(format("getting status of `%1%'") % path);
+            throw SysError(format("getting status of ‘%1%’") % path);
         if (!S_ISLNK(st.st_mode)) break;
         path = absPath(readLink(path), dirOf(path));
     }
@@ -621,10 +621,10 @@ void EvalState::addToSearchPath(const string & s, bool warn)
 
     path = absPath(path);
     if (pathExists(path)) {
-        debug(format("adding path `%1%' to the search path") % path);
+        debug(format("adding path ‘%1%’ to the search path") % path);
         searchPath.push_back(std::pair<string, Path>(prefix, path));
     } else if (warn)
-        printMsg(lvlError, format("warning: Nix search path entry `%1%' does not exist, ignoring") % path);
+        printMsg(lvlError, format("warning: Nix search path entry ‘%1%’ does not exist, ignoring") % path);
 }
 
 
@@ -649,7 +649,7 @@ Path EvalState::findFile(SearchPath & searchPath, const string & path)
         }
         if (pathExists(res)) return canonPath(res);
     }
-    throw ThrownError(format("file `%1%' was not found in the Nix search path (add it using $NIX_PATH or -I)") % path);
+    throw ThrownError(format("file ‘%1%’ was not found in the Nix search path (add it using $NIX_PATH or -I)") % path);
 }
 
 
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 4436b636ba4f..0c4381b11368 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -43,7 +43,7 @@ struct InvalidPathError : EvalError
 {
     Path path;
     InvalidPathError(const Path & path) :
-        EvalError(format("path `%1%' is not valid") % path), path(path) {};
+        EvalError(format("path ‘%1%’ is not valid") % path), path(path) {};
     ~InvalidPathError() throw () { };
 };
 
@@ -82,7 +82,7 @@ static void prim_scopedImport(EvalState & state, const Pos & pos, Value * * args
     try {
         realiseContext(context);
     } catch (InvalidPathError & e) {
-        throw EvalError(format("cannot import `%1%', since path `%2%' is not valid, at %3%")
+        throw EvalError(format("cannot import ‘%1%’, since path ‘%2%’ is not valid, at %3%")
             % path % e.path % pos);
     }
 
@@ -123,7 +123,7 @@ static void prim_scopedImport(EvalState & state, const Pos & pos, Value * * args
                 env->values[displ++] = attr.value;
             }
 
-            startNest(nest, lvlTalkative, format("evaluating file `%1%'") % path);
+            startNest(nest, lvlTalkative, format("evaluating file ‘%1%’") % path);
             Expr * e = state.parseExprFromFile(resolveExprPath(path), staticEnv);
 
             e->eval(state, *env, v);
@@ -145,7 +145,7 @@ static void prim_importNative(EvalState & state, const Pos & pos, Value * * args
     try {
         realiseContext(context);
     } catch (InvalidPathError & e) {
-        throw EvalError(format("cannot import `%1%', since path `%2%' is not valid, at %3%")
+        throw EvalError(format("cannot import ‘%1%’, since path ‘%2%’ is not valid, at %3%")
             % path % e.path % pos);
     }
 
@@ -153,16 +153,16 @@ static void prim_importNative(EvalState & state, const Pos & pos, Value * * args
 
     void *handle = dlopen(path.c_str(), RTLD_LAZY | RTLD_LOCAL);
     if (!handle)
-        throw EvalError(format("could not open `%1%': %2%") % path % dlerror());
+        throw EvalError(format("could not open ‘%1%’: %2%") % path % dlerror());
 
     dlerror();
     ValueInitializer func = (ValueInitializer) dlsym(handle, sym.c_str());
     if(!func) {
         char *message = dlerror();
         if (message)
-            throw EvalError(format("could not load symbol `%1%' from `%2%': %3%") % sym % path % message);
+            throw EvalError(format("could not load symbol ‘%1%’ from ‘%2%’: %3%") % sym % path % message);
         else
-            throw EvalError(format("symbol `%1%' from `%2%' resolved to NULL when a function pointer was expected")
+            throw EvalError(format("symbol ‘%1%’ from ‘%2%’ resolved to NULL when a function pointer was expected")
                     % sym % path);
     }
 
@@ -273,7 +273,7 @@ static void prim_genericClosure(EvalState & state, const Pos & pos, Value * * ar
     Bindings::iterator startSet =
         args[0]->attrs->find(state.symbols.create("startSet"));
     if (startSet == args[0]->attrs->end())
-        throw EvalError(format("attribute `startSet' required, at %1%") % pos);
+        throw EvalError(format("attribute ‘startSet’ required, at %1%") % pos);
     state.forceList(*startSet->value, pos);
 
     ValueList workSet;
@@ -284,7 +284,7 @@ static void prim_genericClosure(EvalState & state, const Pos & pos, Value * * ar
     Bindings::iterator op =
         args[0]->attrs->find(state.symbols.create("operator"));
     if (op == args[0]->attrs->end())
-        throw EvalError(format("attribute `operator' required, at %1%") % pos);
+        throw EvalError(format("attribute ‘operator’ required, at %1%") % pos);
     state.forceValue(*op->value);
 
     /* Construct the closure by applying the operator to element of
@@ -303,7 +303,7 @@ static void prim_genericClosure(EvalState & state, const Pos & pos, Value * * ar
         Bindings::iterator key =
             e->attrs->find(state.symbols.create("key"));
         if (key == e->attrs->end())
-            throw EvalError(format("attribute `key' required, at %1%") % pos);
+            throw EvalError(format("attribute ‘key’ required, at %1%") % pos);
         state.forceValue(*key->value);
 
         if (doneKeys.find(key->value) != doneKeys.end()) continue;
@@ -333,7 +333,7 @@ static void prim_genericClosure(EvalState & state, const Pos & pos, Value * * ar
 static void prim_abort(EvalState & state, const Pos & pos, Value * * args, Value & v)
 {
     PathSet context;
-    throw Abort(format("evaluation aborted with the following error message: `%1%'") %
+    throw Abort(format("evaluation aborted with the following error message: ‘%1%’") %
         state.coerceToString(pos, *args[0], context));
 }
 
@@ -418,13 +418,13 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
     /* Figure out the name first (for stack backtraces). */
     Bindings::iterator attr = args[0]->attrs->find(state.sName);
     if (attr == args[0]->attrs->end())
-        throw EvalError(format("required attribute `name' missing, at %1%") % pos);
+        throw EvalError(format("required attribute ‘name’ missing, at %1%") % pos);
     string drvName;
     Pos & posDrvName(*attr->pos);
     try {
         drvName = state.forceStringNoCtx(*attr->value, pos);
     } catch (Error & e) {
-        e.addPrefix(format("while evaluating the derivation attribute `name' at %1%:\n") % posDrvName);
+        e.addPrefix(format("while evaluating the derivation attribute ‘name’ at %1%:\n") % posDrvName);
         throw;
     }
 
@@ -448,7 +448,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
     foreach (Bindings::iterator, i, *args[0]->attrs) {
         if (i->name == state.sIgnoreNulls) continue;
         string key = i->name;
-        startNest(nest, lvlVomit, format("processing attribute `%1%'") % key);
+        startNest(nest, lvlVomit, format("processing attribute ‘%1%’") % key);
 
         try {
 
@@ -476,28 +476,28 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
                 else if (i->name == state.sSystem) drv.platform = s;
                 else if (i->name == state.sName) {
                     drvName = s;
-                    printMsg(lvlVomit, format("derivation name is `%1%'") % drvName);
+                    printMsg(lvlVomit, format("derivation name is ‘%1%’") % drvName);
                 }
                 else if (key == "outputHash") outputHash = s;
                 else if (key == "outputHashAlgo") outputHashAlgo = s;
                 else if (key == "outputHashMode") {
                     if (s == "recursive") outputHashRecursive = true;
                     else if (s == "flat") outputHashRecursive = false;
-                    else throw EvalError(format("invalid value `%1%' for `outputHashMode' attribute, at %2%") % s % posDrvName);
+                    else throw EvalError(format("invalid value ‘%1%’ for ‘outputHashMode’ attribute, at %2%") % s % posDrvName);
                 }
                 else if (key == "outputs") {
                     Strings tmp = tokenizeString<Strings>(s);
                     outputs.clear();
                     foreach (Strings::iterator, j, tmp) {
                         if (outputs.find(*j) != outputs.end())
-                            throw EvalError(format("duplicate derivation output `%1%', at %2%") % *j % posDrvName);
+                            throw EvalError(format("duplicate derivation output ‘%1%’, at %2%") % *j % posDrvName);
                         /* !!! Check whether *j is a valid attribute
                            name. */
                         /* Derivations cannot be named ‘drv’, because
                            then we'd have an attribute ‘drvPath’ in
                            the resulting set. */
                         if (*j == "drv")
-                            throw EvalError(format("invalid derivation output name `drv', at %1%") % posDrvName);
+                            throw EvalError(format("invalid derivation output name ‘drv’, at %1%") % posDrvName);
                         outputs.insert(*j);
                     }
                     if (outputs.empty())
@@ -506,7 +506,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
             }
 
         } catch (Error & e) {
-            e.addPrefix(format("while evaluating the attribute `%1%' of the derivation `%2%' at %3%:\n")
+            e.addPrefix(format("while evaluating the attribute ‘%1%’ of the derivation ‘%2%’ at %3%:\n")
                 % key % drvName % posDrvName);
             throw;
         }
@@ -557,14 +557,14 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
 
     /* Do we have all required attributes? */
     if (drv.builder == "")
-        throw EvalError(format("required attribute `builder' missing, at %1%") % posDrvName);
+        throw EvalError(format("required attribute ‘builder’ missing, at %1%") % posDrvName);
     if (drv.platform == "")
-        throw EvalError(format("required attribute `system' missing, at %1%") % posDrvName);
+        throw EvalError(format("required attribute ‘system’ missing, at %1%") % posDrvName);
 
     /* Check whether the derivation name is valid. */
     checkStoreName(drvName);
     if (isDerivation(drvName))
-        throw EvalError(format("derivation names are not allowed to end in `%1%', at %2%")
+        throw EvalError(format("derivation names are not allowed to end in ‘%1%’, at %2%")
             % drvExtension % posDrvName);
 
     if (outputHash != "") {
@@ -574,7 +574,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
 
         HashType ht = parseHashType(outputHashAlgo);
         if (ht == htUnknown)
-            throw EvalError(format("unknown hash algorithm `%1%', at %2%") % outputHashAlgo % posDrvName);
+            throw EvalError(format("unknown hash algorithm ‘%1%’, at %2%") % outputHashAlgo % posDrvName);
         Hash h = parseHash16or32(ht, outputHash);
         outputHash = printHash(h);
         if (outputHashRecursive) outputHashAlgo = "r:" + outputHashAlgo;
@@ -610,7 +610,7 @@ static void prim_derivationStrict(EvalState & state, const Pos & pos, Value * *
     /* Write the resulting term into the Nix store directory. */
     Path drvPath = writeDerivation(*store, drv, drvName, state.repair);
 
-    printMsg(lvlChatty, format("instantiated `%1%' -> `%2%'")
+    printMsg(lvlChatty, format("instantiated ‘%1%’ -> ‘%2%’")
         % drvName % drvPath);
 
     /* Optimisation, but required in read-only mode! because in that
@@ -659,7 +659,7 @@ static void prim_storePath(EvalState & state, const Pos & pos, Value * * args, V
        e.g. nix-push does the right thing. */
     if (!isStorePath(path)) path = canonPath(path, true);
     if (!isInStore(path))
-        throw EvalError(format("path `%1%' is not in the Nix store, at %2%") % path % pos);
+        throw EvalError(format("path ‘%1%’ is not in the Nix store, at %2%") % path % pos);
     Path path2 = toStorePath(path);
     if (!settings.readOnlyMode)
         store->ensurePath(path2);
@@ -673,7 +673,7 @@ static void prim_pathExists(EvalState & state, const Pos & pos, Value * * args,
     PathSet context;
     Path path = state.coerceToPath(pos, *args[0], context);
     if (!context.empty())
-        throw EvalError(format("string `%1%' cannot refer to other paths, at %2%") % path % pos);
+        throw EvalError(format("string ‘%1%’ cannot refer to other paths, at %2%") % path % pos);
     mkBool(v, pathExists(path));
 }
 
@@ -704,7 +704,7 @@ static void prim_readFile(EvalState & state, const Pos & pos, Value * * args, Va
     PathSet context;
     Path path = state.coerceToPath(pos, *args[0], context);
     if (!context.empty())
-        throw EvalError(format("string `%1%' cannot refer to other paths, at %2%") % path % pos);
+        throw EvalError(format("string ‘%1%’ cannot refer to other paths, at %2%") % path % pos);
     mkString(v, readFile(path).c_str());
 }
 
@@ -729,7 +729,7 @@ static void prim_findFile(EvalState & state, const Pos & pos, Value * * args, Va
 
         i = v2.attrs->find(state.symbols.create("path"));
         if (i == v2.attrs->end())
-            throw EvalError(format("attribute `path' missing, at %1%") % pos);
+            throw EvalError(format("attribute ‘path’ missing, at %1%") % pos);
         string path = state.coerceToPath(pos, *i->value, context);
 
         searchPath.push_back(std::pair<string, Path>(prefix, path));
@@ -740,7 +740,7 @@ static void prim_findFile(EvalState & state, const Pos & pos, Value * * args, Va
     try {
         realiseContext(context);
     } catch (InvalidPathError & e) {
-        throw EvalError(format("cannot find `%1%', since path `%2%' is not valid, at %3%")
+        throw EvalError(format("cannot find ‘%1%’, since path ‘%2%’ is not valid, at %3%")
             % path % e.path % pos);
     }
 
@@ -799,7 +799,7 @@ static void prim_toFile(EvalState & state, const Pos & pos, Value * * args, Valu
         Path path = *i;
         if (path.at(0) == '=') path = string(path, 1);
         if (isDerivation(path))
-            throw EvalError(format("in `toFile': the file `%1%' cannot refer to derivation outputs, at %2%") % name % pos);
+            throw EvalError(format("in ‘toFile’: the file ‘%1%’ cannot refer to derivation outputs, at %2%") % name % pos);
         refs.insert(path);
     }
 
@@ -829,7 +829,7 @@ struct FilterFromExpr : PathFilter
     {
         struct stat st;
         if (lstat(path.c_str(), &st))
-            throw SysError(format("getting attributes of path `%1%'") % path);
+            throw SysError(format("getting attributes of path ‘%1%’") % path);
 
         /* Call the filter function.  The first argument is the path,
            the second is a string indicating the type of the file. */
@@ -859,11 +859,11 @@ static void prim_filterSource(EvalState & state, const Pos & pos, Value * * args
     PathSet context;
     Path path = state.coerceToPath(pos, *args[1], context);
     if (!context.empty())
-        throw EvalError(format("string `%1%' cannot refer to other paths, at %2%") % path % pos);
+        throw EvalError(format("string ‘%1%’ cannot refer to other paths, at %2%") % path % pos);
 
     state.forceValue(*args[0]);
     if (args[0]->type != tLambda)
-        throw TypeError(format("first argument in call to `filterSource' is not a function but %1%, at %2%") % showType(*args[0]) % pos);
+        throw TypeError(format("first argument in call to ‘filterSource’ is not a function but %1%, at %2%") % showType(*args[0]) % pos);
 
     FilterFromExpr filter(state, *args[0]);
 
@@ -906,7 +906,7 @@ void prim_getAttr(EvalState & state, const Pos & pos, Value * * args, Value & v)
     // !!! Should we create a symbol here or just do a lookup?
     Bindings::iterator i = args[1]->attrs->find(state.symbols.create(attr));
     if (i == args[1]->attrs->end())
-        throw EvalError(format("attribute `%1%' missing, at %2%") % attr % pos);
+        throw EvalError(format("attribute ‘%1%’ missing, at %2%") % attr % pos);
     // !!! add to stack trace?
     if (state.countCalls && i->pos) state.attrSelects[*i->pos]++;
     state.forceValue(*i->value);
@@ -986,14 +986,14 @@ static void prim_listToAttrs(EvalState & state, const Pos & pos, Value * * args,
 
         Bindings::iterator j = v2.attrs->find(state.sName);
         if (j == v2.attrs->end())
-            throw TypeError(format("`name' attribute missing in a call to `listToAttrs', at %1%") % pos);
+            throw TypeError(format("‘name’ attribute missing in a call to ‘listToAttrs’, at %1%") % pos);
         string name = state.forceStringNoCtx(*j->value, pos);
 
         Symbol sym = state.symbols.create(name);
         if (seen.find(sym) == seen.end()) {
             Bindings::iterator j2 = v2.attrs->find(state.symbols.create(state.sValue));
             if (j2 == v2.attrs->end())
-                throw TypeError(format("`value' attribute missing in a call to `listToAttrs', at %1%") % pos);
+                throw TypeError(format("‘value’ attribute missing in a call to ‘listToAttrs’, at %1%") % pos);
 
             v.attrs->push_back(Attr(sym, j2->value, j2->pos));
             seen.insert(sym);
@@ -1039,7 +1039,7 @@ static void prim_functionArgs(EvalState & state, const Pos & pos, Value * * args
 {
     state.forceValue(*args[0]);
     if (args[0]->type != tLambda)
-        throw TypeError(format("`functionArgs' requires a function, at %1%") % pos);
+        throw TypeError(format("‘functionArgs’ requires a function, at %1%") % pos);
 
     if (!args[0]->lambda.fun->matchAttrs) {
         state.mkAttrs(v, 0);
@@ -1098,7 +1098,7 @@ static void prim_tail(EvalState & state, const Pos & pos, Value * * args, Value
 {
     state.forceList(*args[0], pos);
     if (args[0]->list.length == 0)
-        throw Error(format("`tail' called on an empty list, at %1%") % pos);
+        throw Error(format("‘tail’ called on an empty list, at %1%") % pos);
     state.mkList(v, args[0]->list.length - 1);
     for (unsigned int n = 0; n < v.list.length; ++n)
         v.list.elems[n] = args[0]->list.elems[n + 1];
@@ -1247,7 +1247,7 @@ static void prim_substring(EvalState & state, const Pos & pos, Value * * args, V
     PathSet context;
     string s = state.coerceToString(pos, *args[2], context);
 
-    if (start < 0) throw EvalError(format("negative start position in `substring', at %1%") % pos);
+    if (start < 0) throw EvalError(format("negative start position in ‘substring’, at %1%") % pos);
 
     mkString(v, (unsigned int) start >= s.size() ? "" : string(s, start, len), context);
 }
@@ -1297,7 +1297,7 @@ static void prim_hashString(EvalState & state, const Pos & pos, Value * * args,
     string type = state.forceStringNoCtx(*args[0], pos);
     HashType ht = parseHashType(type);
     if (ht == htUnknown)
-      throw Error(format("unknown hash type `%1%', at %2%") % type % pos);
+      throw Error(format("unknown hash type ‘%1%’, at %2%") % type % pos);
 
     PathSet context; // discarded
     string s = state.forceString(*args[1], context);