Add interest bearing mint extension#4464
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…lper The duplicate-detection error in add_extension_interest_bearing_mint_authority referred to "rate authority"; this is the authority helper, not the rate one.
Mirrors how sibling extensions (group pointer, transfer hook, etc.) reserve space when either of their two related fields is provided. The CPI also defaulted to .unwrap() on the rate; default it to 0 so authority-only configurations work, with the authority free to set a non-zero rate later.
Every other extension Expr is run through check_scope.generate_check; the newly added interest-bearing fields skipped it, so the optional-account ergonomics were inconsistent with the rest of the init group.
Adds the interest-bearing rate/authority fields to ConstraintTokenMintGroup, threads them through the constraint builder, and emits checks in generate_constraint_mint that read InterestBearingConfig from the mint and verify current_rate / rate_authority against the user-supplied exprs. Without this, #[account(mint::interest_bearing::authority = ..)] on a non-init account would silently pass. Adds three error codes: ConstraintMintInterestBearingExtension, ConstraintMintInterestBearingAuthority, ConstraintMintInterestBearingRate.
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Apr 27, 2026
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Rebases and adds tests for #3278