The Optional->Concrete unwrap classify rule treated ?i64 -> bool as unwrap+narrow (both builtin), silently yielding false for every optional (present or null). specs.md defines no implicit optional->bool conversion. Reject it: conversions.zig adds an optional_to_bool_reject plan (dst == bool, child != bool); coerce.zig emits a located diagnostic suggesting '!= null'. Covers arg/field-init/return via the shared coerceMode. The if-opt presence test (issue 0164) is a separate path, untouched. Regression: examples/diagnostics/1199-diagnostics-optional-to-bool.sx + conversions.test.zig unit test. Verified by 3 adversarial reviews, suite 789/0. Filed adjacent issue 0179 (whole implicit ?T->concrete unwrap family silently miscompiles a null optional; design-touching).
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