Adding upstream version 1.65.0+dfsg1.upstream/1.65.0+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 25 insertions, 0 deletions

diff --git a/src/tools/clippy/src/docs/ineffective_bit_mask.txt b/src/tools/clippy/src/docs/ineffective_bit_mask.txt
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+### What it does
+Checks for bit masks in comparisons which can be removed
+without changing the outcome. The basic structure can be seen in the
+following table:
+
+|Comparison| Bit Op   |Example     |equals |
+|----------|----------|------------|-------|
+|`>` / `<=`|`\|` / `^`|`x \| 2 > 3`|`x > 3`|
+|`<` / `>=`|`\|` / `^`|`x ^ 1 < 4` |`x < 4`|
+
+### Why is this bad?
+Not equally evil as [`bad_bit_mask`](#bad_bit_mask),
+but still a bit misleading, because the bit mask is ineffective.
+
+### Known problems
+False negatives: This lint will only match instances
+where we have figured out the math (which is for a power-of-two compared
+value). This means things like `x | 1 >= 7` (which would be better written
+as `x >= 6`) will not be reported (but bit masks like this are fairly
+uncommon).
+
+### Example
+```
+if (x | 1 > 3) {  }
+```
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