On a fresh ubuntu 10.10 (x64) installation, via rvm rbx-head...

Fresh rake bootstrap

bakkdoor@bakkdoor-thinkpad:~/Desktop/fancy$ rake bootstrap
(in /home/bakkdoor/Desktop/fancy)
rbx /home/bakkdoor/Desktop/fancy/lib/parser/ext/extconf.rb
checking for main() in -lfl... yes
creating Makefile
make -C /home/bakkdoor/Desktop/fancy/lib/parser/ext
make: Gehe in Verzeichnis '/home/bakkdoor/Desktop/fancy/lib/parser/ext'
gcc -I. -I. -I/home/bakkdoor/.rvm/rubies/rbx-head/include -I/home/bakkdoor/Desktop/fancy/lib/parser/ext  -fPIC -ggdb3 -O2 -fPIC  -c parser.c
gcc -I. -I. -I/home/bakkdoor/.rvm/rubies/rbx-head/include -I/home/bakkdoor/Desktop/fancy/lib/parser/ext  -fPIC -ggdb3 -O2 -fPIC  -c ext.c
gcc -I. -I. -I/home/bakkdoor/.rvm/rubies/rbx-head/include -I/home/bakkdoor/Desktop/fancy/lib/parser/ext  -fPIC -ggdb3 -O2 -fPIC  -c lexer.c
cc -shared -o fancy_parser.so parser.o ext.o lexer.o -L. -L/home/bakkdoor/.rvm/rubies/rbx-head/lib      -lfl   
make: Verlasse Verzeichnis '/home/bakkdoor/Desktop/fancy/lib/parser/ext'
mkdir -p /home/bakkdoor/Desktop/fancy/boot/compiler/parser/ext
cp /home/bakkdoor/Desktop/fancy/lib/parser/ext/fancy_parser.so /home/bakkdoor/Desktop/fancy/boot/compiler/parser/ext/fancy_parser.so
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/boot/compiler/boot.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compile.fyc -- /home/bakkdoor/Desktop/fancy/lib/file.fy /home/bakkdoor/Desktop/fancy/lib/block.fy /home/bakkdoor/Desktop/fancy/lib/enumerable.fy /home/bakkdoor/Desktop/fancy/lib/parser.fy /home/bakkdoor/Desktop/fancy/lib/compiler.fy /home/bakkdoor/Desktop/fancy/lib/fancy_spec.fy /home/bakkdoor/Desktop/fancy/lib/array.fy /home/bakkdoor/Desktop/fancy/lib/boot.fy /home/bakkdoor/Desktop/fancy/lib/rbx.fy /home/bakkdoor/Desktop/fancy/lib/hash.fy /home/bakkdoor/Desktop/fancy/lib/class.fy /home/bakkdoor/Desktop/fancy/lib/eval.fy /home/bakkdoor/Desktop/fancy/lib/method.fy /home/bakkdoor/Desktop/fancy/lib/package.fy /home/bakkdoor/Desktop/fancy/lib/symbol.fy /home/bakkdoor/Desktop/fancy/lib/true_class.fy /home/bakkdoor/Desktop/fancy/lib/fdoc.fy /home/bakkdoor/Desktop/fancy/lib/main.fy /home/bakkdoor/Desktop/fancy/lib/directory.fy /home/bakkdoor/Desktop/fancy/lib/stack.fy /home/bakkdoor/Desktop/fancy/lib/version.fy /home/bakkdoor/Desktop/fancy/lib/documentation.fy /home/bakkdoor/Desktop/fancy/lib/argv.fy /home/bakkdoor/Desktop/fancy/lib/set.fy /home/bakkdoor/Desktop/fancy/lib/number.fy /home/bakkdoor/Desktop/fancy/lib/string.fy /home/bakkdoor/Desktop/fancy/lib/nil_class.fy /home/bakkdoor/Desktop/fancy/lib/fdoc_hook.fy /home/bakkdoor/Desktop/fancy/lib/object.fy
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/boot/compiler/boot.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compile.fyc -- /home/bakkdoor/Desktop/fancy/lib/parser/methods.fy
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/boot/compiler/boot.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compile.fyc -- /home/bakkdoor/Desktop/fancy/lib/compiler/stages.fy /home/bakkdoor/Desktop/fancy/lib/compiler/compiler.fy /home/bakkdoor/Desktop/fancy/lib/compiler/command.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast.fy
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/boot/compiler/boot.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compile.fyc -- /home/bakkdoor/Desktop/fancy/lib/compiler/ast/match.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/method_def.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/block.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/node.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/script.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/return.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/message_send.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/assign.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/class_def.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/identifier.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/literals.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/range.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/singleton_method_def.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/tuple_literal.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/try_catch.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/require.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/expression_list.fy /home/bakkdoor/Desktop/fancy/lib/compiler/ast/super.fy
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/boot/compiler/boot.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compile.fyc -- /home/bakkdoor/Desktop/fancy/lib/rbx/thread.fy /home/bakkdoor/Desktop/fancy/lib/rbx/file.fy /home/bakkdoor/Desktop/fancy/lib/rbx/block.fy /home/bakkdoor/Desktop/fancy/lib/rbx/no_method_error.fy /home/bakkdoor/Desktop/fancy/lib/rbx/exception.fy /home/bakkdoor/Desktop/fancy/lib/rbx/regexp.fy /home/bakkdoor/Desktop/fancy/lib/rbx/code_loader.fy /home/bakkdoor/Desktop/fancy/lib/rbx/bignum.fy /home/bakkdoor/Desktop/fancy/lib/rbx/array.fy /home/bakkdoor/Desktop/fancy/lib/rbx/environment_variables.fy /home/bakkdoor/Desktop/fancy/lib/rbx/hash.fy /home/bakkdoor/Desktop/fancy/lib/rbx/class.fy /home/bakkdoor/Desktop/fancy/lib/rbx/float.fy /home/bakkdoor/Desktop/fancy/lib/rbx/method.fy /home/bakkdoor/Desktop/fancy/lib/rbx/system.fy /home/bakkdoor/Desktop/fancy/lib/rbx/symbol.fy /home/bakkdoor/Desktop/fancy/lib/rbx/name_error.fy /home/bakkdoor/Desktop/fancy/lib/rbx/io.fy /home/bakkdoor/Desktop/fancy/lib/rbx/fixnum.fy /home/bakkdoor/Desktop/fancy/lib/rbx/range.fy /home/bakkdoor/Desktop/fancy/lib/rbx/tcp_socket.fy /home/bakkdoor/Desktop/fancy/lib/rbx/false_class.fy /home/bakkdoor/Desktop/fancy/lib/rbx/directory.fy /home/bakkdoor/Desktop/fancy/lib/rbx/documentation.fy /home/bakkdoor/Desktop/fancy/lib/rbx/tcp_server.fy /home/bakkdoor/Desktop/fancy/lib/rbx/tuple.fy /home/bakkdoor/Desktop/fancy/lib/rbx/string.fy /home/bakkdoor/Desktop/fancy/lib/rbx/console.fy /home/bakkdoor/Desktop/fancy/lib/rbx/object.fy
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/boot/compiler/boot.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compile.fyc -- /home/bakkdoor/Desktop/fancy/lib/package/dependency.fy /home/bakkdoor/Desktop/fancy/lib/package/installer.fy /home/bakkdoor/Desktop/fancy/lib/package/uninstaller.fy /home/bakkdoor/Desktop/fancy/lib/package/specification.fy
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/boot/compiler/boot.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compiler/compile.fyc -- /home/bakkdoor/Desktop/fancy/boot/compile.fy
rbx /home/bakkdoor/Desktop/fancy/boot/load.rb /home/bakkdoor/Desktop/fancy/lib/boot.fyc /home/bakkdoor/Desktop/fancy/lib/compiler.fyc /home/bakkdoor/Desktop/fancy/lib/compiler/command.fyc /home/bakkdoor/Desktop/fancy/boot/compile.fyc -- --output-path /home/bakkdoor/Desktop/fancy/boot/.wootstrap --source-path /home/bakkdoor/Desktop/fancy/lib /home/bakkdoor/Desktop/fancy/lib/file.fy /home/bakkdoor/Desktop/fancy/lib/block.fy /home/bakkdoor/Desktop/fancy/lib/enumerable.fy /home/bakkdoor/Desktop/fancy/lib/parser.fy /home/bakkdoor/Desktop/fancy/lib/compiler.fy /home/bakkdoor/Desktop/fancy/lib/fancy_spec.fy /home/bakkdoor/Desktop/fancy/lib/array.fy /home/bakkdoor/Desktop/fancy/lib/boot.fy /home/bakkdoor/Desktop/fancy/lib/rbx.fy /home/bakkdoor/Desktop/fancy/lib/hash.fy /home/bakkdoor/Desktop/fancy/lib/class.fy /home/bakkdoor/Desktop/fancy/lib/eval.fy /home/bakkdoor/Desktop/fancy/lib/method.fy /home/bakkdoor/Desktop/fancy/lib/package.fy /home/bakkdoor/Desktop/fancy/lib/symbol.fy /home/bakkdoor/Desktop/fancy/lib/true_class.fy /home/bakkdoor/Desktop/fancy/lib/fdoc.fy /home/bakkdoor/Desktop/fancy/lib/main.fy /home/bakkdoor/Desktop/fancy/lib/directory.fy /home/bakkdoor/Desktop/fancy/lib/stack.fy /home/bakkdoor/Desktop/fancy/lib/version.fy /home/bakkdoor/Desktop/fancy/lib/documentation.fy /home/bakkdoor/Desktop/fancy/lib/argv.fy /home/bakkdoor/Desktop/fancy/lib/set.fy /home/bakkdoor/Desktop/fancy/lib/number.fy /home/bakkdoor/Desktop/fancy/lib/string.fy /home/bakkdoor/Desktop/fancy/lib/nil_class.fy /home/bakkdoor/Desktop/fancy/lib/fdoc_hook.fy /home/bakkdoor/Desktop/fancy/lib/object.fy
An exception occurred running /home/bakkdoor/Desktop/fancy/boot/load.rb
    Error trying to compile /home/bakkdoor/Desktop/fancy/lib/set.fy (Rubinius::CompileError)

Backtrace:
     Rubinius::Compiler.compiler_error at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/compiler.rbc:11
  Fancy::Compiler.compile_file:to:line:print: at lib/compiler/compiler.fy:55
  Fancy::Compiler::Command.compile:to:info:print: at lib/compiler/command.fy:41
  { } in Fancy::Compiler::Command.run: at lib/compiler/command.fy:31
                            Array#each at kernel/bootstrap/array.rb:66
         Fancy::Compiler::Command.run: at lib/compiler/command.fy:31
                       main.__script__ at boot/compile.fy:4
  Fancy::BootstrapCodeLoader.load_compiled_file at boot/load.rb:48
                { } in main.__script__ at boot/load.rb:71
                            Array#each at kernel/bootstrap/array.rb:66
                       main.__script__ at boot/load.rb:71
      Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:67
      Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:91
               Rubinius::Loader#script at kernel/loader.rb:494
                 Rubinius::Loader#main at kernel/loader.rb:591
                 Rubinius::Loader.main at kernel/loader.rb:630
                     Object#__script__ at kernel/loader.rb:641

Caused by: undefined method `if:' on nil:NilClass. (NoMethodError)

Backtrace:
  Kernel(NilClass)#if: (method_missing) at kernel/delta/kernel.rb:85
  { } in Fancy::AST::MessageSend#bytecode: at lib/compiler/ast/message_send.fy:14
  { } in Rubinius::BlockEnvironment#Block at boot/fancy_ext/block_env.rb:18
        Object(FalseClass)#if_do:else: at lib/object.fy:71
     Fancy::AST::MessageSend#bytecode: at lib/compiler/ast/message_send.fy:21
  { } in Fancy::AST::ExpressionList#bytecode: at lib/compiler/ast/expression_list.fy:25
  { } in Rubinius::BlockEnvironment#Block at boot/fancy_ext/block_env.rb:18
                    { } in Array#each: at lib/rbx/array.fy:50
                            Array#each at kernel/bootstrap/array.rb:66
                           Array#each: at lib/rbx/array.fy:50
  Fancy::AST::ExpressionList#bytecode: at lib/compiler/ast/expression_list.fy:27
  { } in Fancy::AST::Node(Fancy::AST::ExpressionList)#Node at lib/compiler/ast/node.fy:4
  Rubinius::AST::ClosedScope(Rubinius::AST::ClassScope)#attach_and_call at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/ast/definitions.rbc:154
    Rubinius::AST::ClassScope#bytecode at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/ast/definitions.rbc:499
  Rubinius::AST::Class(Fancy::AST::ClassDef)#bytecode at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/ast/definitions.rbc:476
        Fancy::AST::ClassDef#bytecode: at lib/compiler/ast/class_def.fy:21
  { } in Fancy::AST::ExpressionList#bytecode: at lib/compiler/ast/expression_list.fy:25
  { } in Rubinius::BlockEnvironment#Block at boot/fancy_ext/block_env.rb:18
                    { } in Array#each: at lib/rbx/array.fy:50
                            Array#each at kernel/bootstrap/array.rb:66
                           Array#each: at lib/rbx/array.fy:50
  Fancy::AST::ExpressionList#bytecode: at lib/compiler/ast/expression_list.fy:27
          Fancy::AST::Script#bytecode: at lib/compiler/ast/script.fy:9
  { } in Fancy::AST::Node(Fancy::AST::Script)#Node at lib/compiler/ast/node.fy:4
  { } in Rubinius::AST::Script#bytecode at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/ast/definitions.rbc:870
  Rubinius::AST::Container(Rubinius::AST::Script)#container_bytecode at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/ast/definitions.rbc:763
        Rubinius::AST::Script#bytecode at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/ast/definitions.rbc:868
  Fancy::Compiler::Stages::FancyGenerator#:run at lib/compiler/stages.fy:37
  { } in Fancy::Compiler::Stages::Stage(Fancy::Compiler::Stages::FancyGenerator)#Stage at lib/compiler/stages.fy:17
  Rubinius::Compiler::Stage(Fancy::Compiler::Stages::FancyFileParser)#run_next at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/stages.rbc:51
  { } in Fancy::Compiler::Stages::Stage(Fancy::Compiler::Stages::FancyFileParser)#Stage at lib/compiler/stages.fy:17
  Rubinius::Compiler(Fancy::Compiler)#run at /home/bakkdoor/.rvm/rubies/rbx-head/lib/compiler/compiler.rbc:286
  Fancy::Compiler.compile_file:to:line:print: at lib/compiler/compiler.fy:53
  Fancy::Compiler::Command.compile:to:info:print: at lib/compiler/command.fy:41
  { } in Fancy::Compiler::Command.run: at lib/compiler/command.fy:31
                            Array#each at kernel/bootstrap/array.rb:66
         Fancy::Compiler::Command.run: at lib/compiler/command.fy:31
                       main.__script__ at boot/compile.fy:4
  Fancy::BootstrapCodeLoader.load_compiled_file at boot/load.rb:48
                { } in main.__script__ at boot/load.rb:71
                            Array#each at kernel/bootstrap/array.rb:66
                       main.__script__ at boot/load.rb:71
      Rubinius::CodeLoader#load_script at kernel/delta/codeloader.rb:67
      Rubinius::CodeLoader.load_script at kernel/delta/codeloader.rb:91
               Rubinius::Loader#script at kernel/loader.rb:494
                 Rubinius::Loader#main at kernel/loader.rb:591
                 Rubinius::Loader.main at kernel/loader.rb:630
                     Object#__script__ at kernel/loader.rb:641
rake aborted!
Command failed with status (1): [rbx /home/bakkdoor/Desktop/fancy/boot/load...]
/home/bakkdoor/Desktop/fancy/Rakefile:111:in `__script__'
(See full trace by running task with --trace)