x/website: the EBNF def of `FunctionType`.`Result` is wrong

[fumeboy]

What is the URL of the page with the issue?

https://go.dev/ref/spec#Function_types

the definition in doc is

FunctionType = "func" Signature .
Signature = Parameters [ Result ] .
Result = Parameters | Type .
Parameters = "(" [ ParameterList [ "," ] ] ")" .
ParameterList = ParameterDecl { "," ParameterDecl } .
ParameterDecl = [ IdentifierList ] [ "..." ] Type .

the mistack is

the Result shouldnt be produce by = Parameters. the Parameters support (... T) but you couldnt write func signature like func () (...T)

[fumeboy]

and the complier tell me ...T should be place as final param, not tell me ...T shouldnt be place at Result

[heschi]

cc @ianlancetaylor @griesemer

[ianlancetaylor]

There are many cases where the spec's EBNF syntax accepts code that the text then reports as invalid.