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Merge pull request #112 from shati-semmle/cs/change-notes
C#: Reorder change notes
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change-notes/1.18/analysis-csharp.md

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| **Query** | **Tags** | **Purpose** |
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|-----------------------------|-----------|--------------------------------------------------------------------|
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| Arbitrary file write during zip extraction ("Zip Slip") (cs/zipslip) | security external/cwe/cwe-022 | Identifies zip extraction routines which allow arbitrary file overwrite vulnerabilities.
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| Constant condition (cs/constant-condition) | More results | The query has been generalized to cover both `Null-coalescing left operand is constant (cs/constant-null-coalescing)` and `Switch selector is constant (cs/constant-switch-selector)`. |
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| Exposing internal representation (cs/expose-implementation) | Different results | The query has been rewritten, based on the equivalent Java query. |
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| Local scope variable shadows member (cs/local-shadows-member) | maintainability, readability | Replaces the existing queries [Local variable shadows class member (cs/local-shadows-class-member)](https://help.semmle.com/wiki/display/CSHARP/Local+variable+shadows+class+member), [Local variable shadows struct member (cs/local-shadows-struct-member)](https://help.semmle.com/wiki/display/CSHARP/Local+variable+shadows+struct+member), [Parameter shadows class member (cs/parameter-shadows-class-member)](https://help.semmle.com/wiki/display/CSHARP/Parameter+shadows+class+member), and [Parameter shadows struct member (cs/parameter-shadows-struct-member)](https://help.semmle.com/wiki/display/CSHARP/Parameter+shadows+struct+member). |
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| Null-coalescing left operand is constant (cs/constant-null-coalescing) | No results | The query has been removed, as it is now covered by `Constant condition (cs/constant-condition)`. |
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| Switch selector is constant (cs/constant-switch-selector) | No results | The query has been removed, as it is now covered by `Constant condition (cs/constant-condition)`. |
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| Arbitrary file write during zip extraction ("Zip Slip") (`cs/zipslip`) | security, external/cwe/cwe-022 | Identifies zip extraction routines which allow arbitrary file overwrite vulnerabilities.
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| Local scope variable shadows member (`cs/local-shadows-member`) | maintainability, readability | Replaces the existing queries Local variable shadows class member (`cs/local-shadows-class-member`), Local variable shadows struct member (`cs/local-shadows-struct-member`), Parameter shadows class member (`cs/parameter-shadows-class-member`), and Parameter shadows struct member (`cs/parameter-shadows-struct-member`). |
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## Changes to existing queries
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| **Query** | **Expected impact** | **Change** |
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|----------------------------|------------------------|------------------------------------------------------------------|
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| [Missing Dispose call on local IDisposable (cs/local-not-disposed)](https://help.semmle.com/wiki/display/CSHARP/Missing+Dispose+call+on+local+IDisposable) | Fewer results | The query identifies more cases where the local variable may be disposed by a library call. |
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| [Nested loops with same variable (cs/nested-loops-with-same-variable)](https://help.semmle.com/wiki/display/CSHARP/Nested+loops+with+same+variable) | Fewer results | Results are no longer highlighted in nested loops that share the same condition, and do not use the variable after the inner loop. |
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| [Potentially incorrect CompareTo(...) signature (cs/wrong-compareto-signature)](https://help.semmle.com/wiki/display/CSHARP/Potentially+incorrect+CompareTo%28...%29+signature) | Fewer results | Results are no longer highlighted in constructed types. |
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| [Useless upcast (cs/useless-upcast)](https://help.semmle.com/wiki/display/CSHARP/Useless+upcast) | Fewer results | The query has been improved to cover more cases where upcasts may be needed. |
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| [Constant condition](https://help.semmle.com/wiki/display/CSHARP/Constant+condition) (`cs/constant-condition`) | More results | The query has been generalized to cover both Null-coalescing left operand is constant (`cs/constant-null-coalescing`) and Switch selector is constant (`cs/constant-switch-selector`). |
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| Exposing internal representation (`cs/expose-implementation`) | Different results | The query has been rewritten, based on the [equivalent Java query](https://help.semmle.com/wiki/display/JAVA/Exposing+internal+representation). |
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| Local variable shadows class member(`cs/local-shadows-class-member`) | No results | The query has been replaced by Local scope variable shadows member (`cs/local-shadows-member`). |
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| Local variable shadows struct member (`cs/local-shadows-struct-member`) | No results | The query has been replaced by Local scope variable shadows member (`cs/local-shadows-member`). |
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| [Missing Dispose call on local IDisposable](https://help.semmle.com/wiki/display/CSHARP/Missing+Dispose+call+on+local+IDisposable) (`cs/local-not-disposed`) | Fewer results | The query identifies more cases where the local variable may be disposed by a library call. |
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| [Nested loops with same variable](https://help.semmle.com/wiki/display/CSHARP/Nested+loops+with+same+variable) (`cs/nested-loops-with-same-variable`) | Fewer results | Results are no longer highlighted in nested loops that share the same condition, and do not use the variable after the inner loop. |
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| Null-coalescing left operand is constant (`cs/constant-null-coalescing`) | No results | The query has been removed, as it is now covered by Constant condition (`cs/constant-condition`). |
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| Parameter shadows class member (`cs/parameter-shadows-class-member`) | No results | The query has been replaced by Local scope variable shadows member (`cs/local-shadows-member`). |
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| Parameter shadows struct member (`cs/parameter-shadows-struct-member`) | No results | The query has been replaced by Local scope variable shadows member (`cs/local-shadows-member`). |
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| [Potentially incorrect CompareTo(...) signature](https://help.semmle.com/wiki/display/CSHARP/Potentially+incorrect+CompareTo%28...%29+signature) (`cs/wrong-compareto-signature`) | Fewer results | Results are no longer highlighted in constructed types. |
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| Switch selector is constant (`cs/constant-switch-selector`) | No results | The query has been removed, as it is now covered by Constant condition (`cs/constant-condition`). |
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| [Useless upcast](https://help.semmle.com/wiki/display/CSHARP/Useless+upcast) (`cs/useless-upcast`) | Fewer results | The query has been improved to cover more cases where upcasts may be needed. |
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## Changes to code extraction
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* *Series of bullet points*
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## Changes to QL libraries
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* A new non-member predicate `mayBeDisposed()` can be used to determine if a variable is potentially disposed inside a library. It will analyse the CIL code in the library to determine this.
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* A new non-member predicate `mayBeDisposed()` can be used to determine if a variable is potentially disposed inside a library. It will analyse the CIL code in the library to determine this.

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