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Just proper installation command how it is done with modern Go.

Constants now have rule part in there name, they look like constantRuleName... now.

• Ensure utility returns not 0 If translation failed
• Introduce tests on intentionally wrong rules checking they cannot be compiled

Custom types in fields are supported. They (types) should be predeclared with their name and import path for external ones.

Something like

type time.Time from "time";
type localType;

Rule = Time(time.Time) ' ' LocalValue(localType);

Grammar fix based on https://stackoverflow.com/questions/17844248/when-is-eof-needed-in-antlr-4

Put comment in front of check length action

Fixed a bug when action like *'@' generates broken code for --go-string