lang: Require Discriminator
trait impl when using the zero
constraint
#3118
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Problem
zero
constraint assumes the discriminator length is always 8:anchor/lang/syn/src/codegen/accounts/constraints.rs
Lines 207 to 213 in c06ec44
Summary of changes
zero
constraint from the account'sDiscriminator
trait implementationAccount
orAccountLoader
when using thezero
constraint to give a more friendly error message rather thanrustc
generated compile errorNote: This PR is part of a greater effort explained in #3097.