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August 22, 2025 22:09
--> src/main.rs:44:16 | 44 | sum += adder.compute(10); // 隐式转换 i32 到 i64 | ^^^^^^^^^^^^^^^^^ expected , found error[E0277]: cannot add-assign to
0xganz
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Aug 29, 2025
tutorial/10_trait_objects.md
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| let mut sum: i64 = 0; | ||
| for _ in 0..1000000 { | ||
| sum += adder.compute(10); // 隐式转换 i32 到 i64 | ||
| sum += adder.compute(10) as i64; // 隐式转换 i32 到 i64 |
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加了
as i64，就不是隐式转换了
是的是的，忘了改之前的注释，rust不支持这种隐式转换。重新改了一下注释
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