/Users/jvasileff/Applications/eclipse-4.4.1-ceylon/plugins/com.redhat.ceylon.dist.repo_1.1.1.v20150115-0214/repo/ceylon/language/1.1.1/ceylon.language-1.1.1.js:2611
var size = this.codePoints + other.codePoints;
^
TypeError: Cannot read property 'codePoints' of undefined
at String.$init$$_String.string$.plus (/Users/jvasileff/Applications/eclipse-4.4.1-ceylon/plugins/com.redhat.ceylon.dist.repo_1.1.1.v20150115-0214/repo/ceylon/language/1.1.1/ceylon.language-1.1.1.js:2611:35)
at JsCallable.f2 (/Users/jvasileff/Applications/eclipse-4.4.1-ceylon/plugins/com.redhat.ceylon.dist.repo_1.1.1.v20150115-0214/repo/ceylon/language/1.1.1/ceylon.language-1.1.1.js:617:10)
at ru (/Users/jvasileff/Applications/eclipse-4.4.1-ceylon/plugins/com.redhat.ceylon.dist.repo_1.1.1.v20150115-0214/repo/ceylon/language/1.1.1/ceylon.language-1.1.1.js:3266:49)
at $JsCallable.nm (/Users/jvasileff/Applications/eclipse-4.4.1-ceylon/plugins/com.redhat.ceylon.dist.repo_1.1.1.v20150115-0214/repo/ceylon/language/1.1.1/ceylon.language-1.1.1.js:3126:208)
at rf (/Users/jvasileff/Applications/eclipse-4.4.1-ceylon/plugins/com.redhat.ceylon.dist.repo_1.1.1.v20150115-0214/repo/ceylon/language/1.1.1/ceylon.language-1.1.1.js:3245:8)
at exec2 (/Users/jvasileff/Dropbox/Repos/jv/sandbox-ceylon-snapjs/modules/sandbox/ceylon/snapjs/base/0.0.1/sandbox.ceylon.snapjs.base-0.0.1.js:129:17)
at uncurryJS (/Users/jvasileff/Dropbox/Repos/jv/sandbox-ceylon-snapjs/modules/sandbox/ceylon/snapjs/base/0.0.1/sandbox.ceylon.snapjs.base-0.0.1.js:115:5)
at [eval]:1:354
at Object.<anonymous> ([eval]-wrapper:6:22)
at Module._compile (module.js:456:26)
The code below produces an error in the last three cases:
The error: