Fix grammar of ConstParam
#2036
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The grammar for `ConstParam` in https://doc.rust-lang.org/reference/items/generics.html#grammar-ConstParam was specified as: ```grammar ConstParam → 'const' IDENTIFIER : Type ( '=' BlockExpression | IDENTIFIER | '-'? LiteralExpression )? ``` This implies that `IDENTIFIER` and `'-'? LiteralExpression` may not be preceded by `=`, but this is obviously not the case.
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The grammar for
ConstParamin https://doc.rust-lang.org/reference/items/generics.html#grammar-ConstParam was specified as:This implies that
IDENTIFIERand'-'? LiteralExpressionmay not be preceded by=, but this is obviously not the case.