kill old EBNF in comments

src/schala_lang/parsing.rs

@@ -246,57 +246,6 @@ mod schala_tokenizer_tests {
   }
 }
 
-/*
-Schala (PROVISIONAL!!) EBNF grammar
-
-'' = literal, all other symbols are nonterminals
-
-program := (statement delimiter ?)*
-delimiter := 'Newline' | ';'
-statement := declaration | expression
-
-declaration := module | function | type_decl
-
-type_decl := 'type' type_format
-type_format := 'alias' '=' type | type_constructor
-type_constructor := capital_ident '=' type_rhs
-type_rhs := struct_decl | type_variant ('|' type_variant)*
-struct_decl := 'struct' '{' (ident ':' type)* '}'
-type_variant := capital_ident | tuple_type | capital_ident struct_decl
-tuple_type := // something like Variant(a,b)
-type := // something like Type[A[b]]
-
-ascription := expression (':' type)+
-
-function := 'fn' prototype '{' (statement)* '}'
-prototype := identifier '(' identlist ')'
-identlist := identifier (',' identifier)* | ε
-
-
-declaration :=  FN prototype LCurlyBrace (statement)* RCurlyBrace
-prototype := identifier LParen identlist RParen
-identlist := Ident (Comma Ident)* | ε
-exprlist  := Expression (Comma Expression)* | ε
-itemlist  := Ident COLON Expression (Comma Ident COLON Expression)* | ε
-
-expression := postop_expression (op postop_expression)*
-postop_expression := primary_expression postop
-primary_expression :=  number_expr | String | identifier_expr | paren_expr | conditional_expr | while_expr | lambda_expr | list_expr | struct_expr
-number_expr := (PLUS | MINUS ) number_expr | Number
-identifier_expr := call_expression | Variable
-list_expr := LSquareBracket exprlist RSquareBracket
-struct_expr := LCurlyBrace itemlist RCurlyBrace
-call_expression := Identifier LParen exprlist RParen
-while_expr := WHILE primary_expression LCurlyBrace (expression delimiter)* RCurlyBrace
-paren_expr := LParen expression RParen
-conditional_expr := IF expression LCurlyBrace (expression delimiter)* RCurlyBrace (LCurlyBrace (expresion delimiter)* RCurlyBrace)?
-lambda_expr := FN LParen identlist RParen LCurlyBrace (expression delimiter)* RCurlyBrace
-lambda_call :=  | LParen exprlist RParen
-postop := ε | LParen exprlist RParen | LBracket expression RBracket
-op := '+', '-', etc.
-*/
-
-
 /* for reference, here is the scala EBNF for expressions:
  * see http://scala-lang.org/files/archive/spec/2.12/06-expressions.html