public Stmt GetImpl(Ctx ctx)
{
var obj = ctx.MethodParameter(0, "obj");
var toType = ctx.MethodParameter(1);
var callCanAssignTo = new ExprCall(ctx, (Func <object, Type, bool>)CanAssignTo, null, obj.Expr, toType).Named("callCanAssignTo");
var mCtorEx = ctx.Module.Import(typeof(InvalidCastException).GetConstructor(new[] { typeof(string) }));
var mGetType = ctx.Module.Import(typeof(object).GetMethod("GetType"));
var getTypeCall = new ExprCall(ctx, mGetType, obj.Expr);
var msgParts = new Expr[] {
new ExprLiteral(ctx, "Unable to cast object of type '", ctx.String),
new ExprCall(ctx, typeof(Type).GetProperty("FullName").GetMethod, getTypeCall),
new ExprLiteral(ctx, "' to type '", ctx.String),
new ExprCall(ctx, typeof(Type).GetProperty("FullName").GetMethod, toType),
new ExprLiteral(ctx, "'.", ctx.String)
};
var msg = msgParts.Aggregate((a, b) => new ExprBinary(ctx, BinaryOp.Add, ctx.String, a, b));
var ctorEx = new ExprNewObj(ctx, mCtorEx, msg).Named("callCtorEx");
var js = @"
if (callCanAssignTo) return obj;
throw callCtorEx
";
var stmt = new StmtJsExplicit(ctx, js, callCanAssignTo, obj, ctorEx);
return(stmt);
}