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C# 14: [TEST ONLY] Simple lambda parameters with modifiers. #21285

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C# 14: [TEST ONLY] Simple lambda parameters with modifiers. #21285

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62a6b59
C#: Add test cases for lambda parameter modifiers.
michaelnebel Feb 6, 2026
e550d49
C#: Update parameter modifiers test to include lambda expression from…
michaelnebel Feb 6, 2026
6c355a1
C#: Update test expected output.
michaelnebel Feb 6, 2026
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30 changes: 30 additions & 0 deletions csharp/ql/test/library-tests/parameters/LambdaParameterModifiers.cs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,30 @@
using System;
using System.Collections.Generic;

public class LambdaParameterModifiers
{
delegate void MyRef(ref int i1);
delegate void MyOut(out int i2);
delegate void MyIn(in int i3);
delegate void MyRefReadonly(ref readonly int i4);

delegate void MyScopedRef(scoped ref int i5);

public void M()
{
// Explicitly typed lambda parameters with modifiers.
var l1 = (ref int x1) => x1;
var l2 = (out int x2) => x2 = 0;
var l3 = (in int x3) => x3;
var l4 = (ref readonly int x4) => x4;
var l5 = (scoped ref int x5) => x5;
var l6 = (params IEnumerable<int> x6) => x6;

// Implicitly typed lambda parameters with modifiers.
MyRef l7 = (ref i1) => { };
MyOut l8 = (out i2) => i2 = 0;
MyIn l9 = (in i3) => { };
MyRefReadonly l10 = (ref readonly i4) => { };
MyScopedRef l11 = (scoped ref i5) => { };
}
}
22 changes: 22 additions & 0 deletions csharp/ql/test/library-tests/parameters/ParameterModifiers.expected
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Original file line number Diff line number Diff line change
@@ -1,4 +1,15 @@
parameterModifier
| LambdaParameterModifiers.cs:16:27:16:28 | x1 | 1 |
| LambdaParameterModifiers.cs:17:27:17:28 | x2 | 2 |
| LambdaParameterModifiers.cs:18:26:18:27 | x3 | 5 |
| LambdaParameterModifiers.cs:19:36:19:37 | x4 | 6 |
| LambdaParameterModifiers.cs:20:34:20:35 | x5 | 1 |
| LambdaParameterModifiers.cs:21:43:21:44 | x6 | 3 |
| LambdaParameterModifiers.cs:24:25:24:26 | i1 | 1 |
| LambdaParameterModifiers.cs:25:25:25:26 | i2 | 2 |
| LambdaParameterModifiers.cs:26:23:26:24 | i3 | 5 |
| LambdaParameterModifiers.cs:27:43:27:44 | i4 | 6 |
| LambdaParameterModifiers.cs:28:39:28:40 | i5 | 1 |
| ParameterModifiers.cs:6:27:6:28 | p1 | 0 |
| ParameterModifiers.cs:7:30:7:31 | p2 | 5 |
| ParameterModifiers.cs:9:31:9:32 | p3 | 2 |
Expand All @@ -9,13 +20,24 @@ parameterModifier
parameterIsValue
| ParameterModifiers.cs:6:27:6:28 | p1 |
parameterIsIn
| LambdaParameterModifiers.cs:18:26:18:27 | x3 |
| LambdaParameterModifiers.cs:26:23:26:24 | i3 |
| ParameterModifiers.cs:7:30:7:31 | p2 |
parameterIsOut
| LambdaParameterModifiers.cs:17:27:17:28 | x2 |
| LambdaParameterModifiers.cs:25:25:25:26 | i2 |
| ParameterModifiers.cs:9:31:9:32 | p3 |
parameterIsRef
| LambdaParameterModifiers.cs:16:27:16:28 | x1 |
| LambdaParameterModifiers.cs:20:34:20:35 | x5 |
| LambdaParameterModifiers.cs:24:25:24:26 | i1 |
| LambdaParameterModifiers.cs:28:39:28:40 | i5 |
| ParameterModifiers.cs:14:31:14:32 | p4 |
parameterIsParams
| LambdaParameterModifiers.cs:21:43:21:44 | x6 |
| ParameterModifiers.cs:16:36:16:37 | p5 |
| ParameterModifiers.cs:20:47:20:48 | p7 |
parameterIsReadonlyRef
| LambdaParameterModifiers.cs:19:36:19:37 | x4 |
| LambdaParameterModifiers.cs:27:43:27:44 | i4 |
| ParameterModifiers.cs:18:40:18:41 | p6 |
7 changes: 6 additions & 1 deletion csharp/ql/test/library-tests/parameters/ParameterModifiers.ql
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Original file line number Diff line number Diff line change
@@ -1,7 +1,12 @@
import csharp

class TestParameter extends Parameter {
TestParameter() { this.getFile().getBaseName() = "ParameterModifiers.cs" }
TestParameter() {
this.getFile().getBaseName() = "ParameterModifiers.cs"
or
this.getFile().getBaseName() = "LambdaParameterModifiers.cs" and
this.getCallable() instanceof LambdaExpr
}
}

query predicate parameterModifier(TestParameter p, int kind) { params(p, _, _, _, kind, _, _) }
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