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15c15
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< var b: u32 = addTwenty(4) ??? 22;
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---
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> var b: u32 = addTwenty(4) catch 22;
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22c22
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< fn addTwenty(n: u32) ??? {
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---
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> fn addTwenty(n: u32) MyNumberError!u32 {
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