Duplicate rule name generates faulty Go-code. Should throw an error #157
Description
If you accidentally define two rules with the same name, the parser generator will generate faulty code making it very difficult to troubleshoot. It should throw an error instead.
Example grammar:
#go:build grammars
# +build grammars
package experiments
type Test Peg {}
Expression <-
FOO { fmt.Println("FOO") }
BAR { fmt.Println("BAR") } !.
FOO <- "foo"
BAR <- "bar"
FOO <- "foo"
More specifically, the parser generator seems to omit one of the rules from the rule array, causing subsequent indices to mismatch and the wrong rules being invoked.