less.js: Broken on node v6.0.0

Running

lessc main.less build.css

won’t output any error and no build file.

Running with nodemon yields more info:

› nodemon -e less --exec 'lessc src/main.less build.css'
(node) v8::ObjectTemplate::Set() with non-primitive values is deprecated
(node) and will stop working in the next major release.

==== JS stack trace =========================================

Security context: 0x36610d2c9fa9 <JS Object>#0#
    1: .node [module.js:568] [pc=0x1aa0081d0f64] (this=0x225da61d89b9 <an Object with map 0x7af7e117be1>#1#,module=0x2666c00042f1 <a Module with map 0x7af7e1181b9>#2#,filename=0x2666c0004251 <String[136]: /Users/zigomir/.nvm/versions/node/v6.0.0/lib/node_modules/nodemon/node_modules/fsevents/lib/binding/Release/node-v48-darwin-x64/fse.node>)
    2: load [module.js:456] [pc=0x1aa008138e72] (this=0x2666c00042f1 <a Module with map 0x7af7e1181b9>#2#,filename=0x2666c0004251 <String[136]: /Users/zigomir/.nvm/versions/node/v6.0.0/lib/node_modules/nodemon/node_modules/fsevents/lib/binding/Release/node-v48-darwin-x64/fse.node>)
    3: tryModuleLoad(aka tryModuleLoad) [module.js:415] [pc=0x1aa00813899d] (this=0x36610d204189 <undefined>,module=0x2666c00042f1 <a Module with map 0x7af7e1181b9>#2#,filename=0x2666c0004251 <String[136]: /Users/zigomir/.nvm/versions/node/v6.0.0/lib/node_modules/nodemon/node_mo 1: v8::Template::Set(v8::Local<v8::Name>, v8::Local<v8::Data>, v8::PropertyAttribute)
 2: fse::FSEvents::Initialize(v8::Local<v8::Object>)
 3: node::DLOpen(v8::FunctionCallbackInfo<v8::Value> const&)
 4: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&))
 5: v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)1>)
 6: v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*)
 7: 0x1aa00800961b
 8: 0x1aa0081d0f64
(node) v8::ObjectTemplate::Set() with non-primitive values is deprecated
(node) and will stop working in the next major release.

==== JS stack trace =========================================

Security context: 0x36610d2c9fa9 <JS Object>#0#
    1: .node [module.js:568] [pc=0x1aa0081d0f64] (this=0x225da61d89b9 <an Object with map 0x7af7e117be1>#1#,module=0x2666c00042f1 <a Module with map 0x7af7e1181b9>#2#,filename=0x2666c0004251 <String[136]: /Users/zigomir/.nvm/versions/node/v6.0.0/lib/node_modules/nodemon/node_modules/fsevents/lib/binding/Release/node-v48-darwin-x64/fse.node>)
    2: load [module.js:456] [pc=0x1aa008138e72] (this=0x2666c00042f1 <a Module with map 0x7af7e1181b9>#2#,filename=0x2666c0004251 <String[136]: /Users/zigomir/.nvm/versions/node/v6.0.0/lib/node_modules/nodemon/node_modules/fsevents/lib/binding/Release/node-v48-darwin-x64/fse.node>)
    3: tryModuleLoad(aka tryModuleLoad) [module.js:415] [pc=0x1aa00813899d] (this=0x36610d204189 <undefined>,module=0x2666c00042f1 <a Module with map 0x7af7e1181b9>#2#,filename=0x2666c0004251 <String[136]: /Users/zigomir/.nvm/versions/node/v6.0.0/lib/node_modules/nodemon/node_mo 1: v8::Template::Set(v8::Local<v8::Name>, v8::Local<v8::Data>, v8::PropertyAttribute)
 2: fse::FSEvents::Initialize(v8::Local<v8::Object>)
 3: node::DLOpen(v8::FunctionCallbackInfo<v8::Value> const&)
 4: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&))
 5: v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::(anonymous namespace)::BuiltinArguments<(v8::internal::BuiltinExtraArguments)1>)
 6: v8::internal::Builtin_HandleApiCall(int, v8::internal::Object**, v8::internal::Isolate*)
 7: 0x1aa00800961b
 8: 0x1aa0081d0f64