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由 Eduard Bopp 提交于
Closes #12366. Parentheses around assignment statements such as let mut a = (0); a = (1); a += (2); are not necessary and therefore an unnecessary_parens warning is raised when statements like this occur. The warning mechanism was refactored along the way to allow for code reuse between the routines for checking expressions and statements. Code had to be adopted throughout the compiler and standard libraries to comply with this modification of the lint.
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