Switches examines the control-flow graph of fn and returns the set of inferred value and type switches. A value switch tests an ssa.Value for equality against two or more compile-time constant values. Switches involving link-time constants (addresses) are ignored. A type switch type-asserts an ssa.Value against two or more types.

The switches are returned in dominance order.

The resulting switches do not necessarily correspond to uses of the 'switch' keyword in the source: for example, a single source-level switch statement with non-constant cases may result in zero, one or many Switches, one per plural sequence of constant cases. Switches may even be inferred from if/else- or goto-based control flow. (In general, the control flow constructs of the source program cannot be faithfully reproduced from the SSA representation.)