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diff --git a/src/docs/assign_op_pattern.txt b/src/docs/assign_op_pattern.txt
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index f355c0cc18d..00000000000
--- a/src/docs/assign_op_pattern.txt
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-### What it does
-Checks for `a = a op b` or `a = b commutative_op a`
-patterns.
-
-### Why is this bad?
-These can be written as the shorter `a op= b`.
-
-### Known problems
-While forbidden by the spec, `OpAssign` traits may have
-implementations that differ from the regular `Op` impl.
-
-### Example
-```
-let mut a = 5;
-let b = 0;
-// ...
-
-a = a + b;
-```
-
-Use instead:
-```
-let mut a = 5;
-let b = 0;
-// ...
-
-a += b;
-```
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