Executes a Verilog program using the Icarus Verilog two-step toolchain: iverilog -o <out> <file.v> followed by vvp <out>.

Normalises Verilog forms for execution.

• A single symbol (usually a module pointer) is emitted as-is.
• A single module definition is emitted as-is.
• A single non-module statement is wrapped in a temporary testbench module.
• A sequence of forms keeps module definitions at the top level and wraps the remaining statements in a testbench module.

If the wrapped statements already contain an initial/always block they are placed directly inside the module body; otherwise they are wrapped in an initial block and $finish is appended so the simulator terminates.