This ticket fixes the issue generics was causing in parseAndAugment. The problem was that FuncKey didn't handle *ast.IndexListExpr nor *ast.IndexExpr since those were introduced in function names for generics. This ticket has the following changes:

• Update FuncKey to handle generics.
• compiler/natives/src/net/http/http.go imports io/util which is no longer used in original runtime so causes the "extra import tests" in build_test.go to fail, so I also updated it to use io.
• Minor lint fix for creating an error.