There is: "An extern module declaration consists of the keyword extern followed by the module name and the list of ports for the module." it suggest that it is ok to write: extern module_name(bit clk); It should be changed: "An extern module declaration consists of the keyword extern followed module keyword and then by the module name and the list of ports for the module."
extern
module
followed by the moduleextern interface
look analogous.or smth similar if interface and programs are allowed DANiel
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