Using F# keywords for non terminal names does not compile about fslexyacc

[gdziadkiewicz]

I wonder if compile error for '<keyword> or ^<keyword> type parameters is expected in F# or if it's a bug in the compiler. I will try to check the specs.

If it's expected then your change solves the problem and if not then we can use it as a workaround for the compiler bug.

[gdziadkiewicz]

According to the syntax specs in https://fsharp.org/specs/language-spec/4.1/FSharpSpec-4.1-latest.pdf it works as expected.

[thautwarm]

According to the specification(search type variable in the pdf):

type :=
 ( type )
 type -> type -- function type
 type * ... * type -- tuple type
 typar
 ...


typar :=
 _ -- anonymous variable type
 'ident -- type variable
 ^ident -- static head-type type variable

ident-keyword and ident seem to be distingushable according the specification, so I'd think 'type is not a bug, i.e., my PR solves the problem.

However, 'ident can still be unexpected to the compiler team because I don't see a reason to reject type variables like 'type.

[thautwarm]

appreciate for your fast check.