I'm using Ragel 6.10 with Go. I'm sure it's likely an issue with my code but I'm getting some weird errors when I try to use a stack with a scanner block. I'm trying to setup bracket matching and my code looks roughly like this;
ObjectValues := |*
# other stuff
'}' => { fret; };
*|
main := ('{' @{fcall ObjectValues;})*;
Looking at page 46 in the guide it looks like this should be possible. When I run Ragel ragel -G2 -Z main.rl. I get the following error when I try to compile (it only happens for -G2 FSM generation);
graphql_collections.rl:47[/Users/nathanfisher/workspace/go/src/github.com/nfisher/gir/graphql_collections.go:325:2]: syntax error: unexpected goto at end of statement
graphql_collections.go:60[/Users/nathanfisher/workspace/go/src/github.com/nfisher/gir/graphql_collections.go:60:1]: label _again defined and not used
Commenting out the fret line removes the error and warns postpop and prepush are unreachable.
The full code is here;
https://github.com/nfisher/gir/blob/broken/graphql_collections.rl#L47
A working minimal test-case is here;
https://gist.github.com/nfisher/649ca816f82bb3ccd7164331ac2324ac
Error for test-case;
main.rl:13[/Users/nathanfisher/workspace/go/src/github.com/nfisher/gir/command/runner/main.go:119:2]: syntax error: unexpected goto at end of statement
main.go:59[/Users/nathanfisher/workspace/go/src/github.com/nfisher/gir/command/runner/main.go:59:1]: label _again defined and not used
It looks like this is an issue relating to Ragel's generated code in v 6.10. Using the HEAD of ragel-6 branch fixes the issue. Thanks to Adrian Thurston for being super responsive/helpful via Twitter. :)
Reformatting the code from this;
To this fixes the error;