whitespace
utility code construction for struct conversion requires constructing the field conversion functions as well

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extra : transplant_source : %A3%81%87%E2%0A%20%DA%7D%7E%5B%A0%9B%80i%F9%8Az%9B%F3%DC
add test for utility code inclusion in conversion of external structs
merge 0.20.x branch into master