* Duplicate variants in the same type declaration
* Duplicate parameter in the same function declaration
* Shadowing of predefined value in a declaration
I fixed the architecture for that support: ParserMain.ml is now where
those specific errors are handled, and they are produced by the
semantic actions of the parsers.
* [CameLIGO/ReasonLIGO] The AST node [EAnnot] (expressions
annotated by a type) now records the region in the source
code for the colon.
* [CameLIGO/ReasonLIGO/PascaLIGO] I added the syntax
%token <...> TOKEN "lexeme"
* [ReasonLIGO] I changed the AST nodes [Mtz] and [Str] to
[Mutez] and [String], respectively (in accordance with the
PascaLIGO front-end). I changed token [DOTDOTDOT] to
[ELLIPSIS].
* [ReasonLIGO] I added what was missing to make a loca build
with my Makefile.
