Ql: Fix some Ql4Ql violations.

ql/ql/src/codeql_ql/style/RedundantCastQuery.qll

@@ -1,11 +1,12 @@
 import ql
 
 class RedundantInlineCast extends AstNode instanceof InlineCast {
-  Type t;
-
   RedundantInlineCast() {
-    t = unique( | | super.getType()) and
-    (
+    exists(Type t |
+      t = unique( | | super.getType()) and
+      // noopt can require explicit casts
+      not this.getEnclosingPredicate().getAnAnnotation() instanceof NoOpt
+    |
       // The cast is to the type the base expression already has
       t = unique( | | super.getBase().getType())
       or
@@ -23,9 +24,7 @@ class RedundantInlineCast extends AstNode instanceof InlineCast {
         target = unique( | | call.getTarget()) and
         t = unique( | | target.getParameterType(i))
       )
-    ) and
-    // noopt can require explicit casts
-    not this.getEnclosingPredicate().getAnAnnotation() instanceof NoOpt
+    )
   }
 
   TypeExpr getTypeExpr() { result = super.getTypeExpr() }
@@ -49,15 +48,16 @@ private class AnyCast extends AstNode instanceof FullAggregate {
 // `foo = any(Bar b)` is effectively a cast to `Bar`.
 class RedundantAnyCast extends AstNode instanceof ComparisonFormula {
   AnyCast cast;
-  Expr operand;
 
   RedundantAnyCast() {
     super.getOperator() = "=" and
     super.getAnOperand() = cast and
-    super.getAnOperand() = operand and
-    cast != operand and
-    unique( | | operand.getType()).getASuperType*() =
-      unique( | | cast.getTypeExpr().getResolvedType()) and
+    exists(Expr operand |
+      super.getAnOperand() = operand and
+      cast != operand and
+      unique( | | operand.getType()).getASuperType*() =
+        unique( | | cast.getTypeExpr().getResolvedType())
+    ) and
     not this.getEnclosingPredicate().getAnAnnotation() instanceof NoOpt
   }
 

ql/ql/test/queries/performance/VarUnusedInDisjunct/Test.qll

@@ -165,4 +165,6 @@ class HasField extends Big {
     or
     this.toString().matches("%foo") // <- field only defined here.
   }
+
+  Big getField() { result = field }
 }

ql/ql/test/queries/style/Misspelling/Misspelling.expected

@@ -2,5 +2,5 @@
 | Test.qll:4:7:4:26 | Class PublicallyAccessible | This class name contains the common misspelling 'publically', which should instead be 'publicly'. |
 | Test.qll:5:3:5:20 | FieldDecl | This field name contains the common misspelling 'occurences', which should instead be 'occurrences'. |
 | Test.qll:10:13:10:23 | ClassPredicate hasAgrument | This predicate name contains the common misspelling 'agrument', which should instead be 'argument'. |
-| Test.qll:13:1:16:3 | QLDoc | This comment contains the non-US spelling 'colour', which should instead be 'color'. |
-| Test.qll:17:7:17:17 | Class AnalysedInt | This class name contains the non-US spelling 'analysed', which should instead be 'analyzed'. |
+| Test.qll:15:1:18:3 | QLDoc | This comment contains the non-US spelling 'colour', which should instead be 'color'. |
+| Test.qll:19:7:19:17 | Class AnalysedInt | This class name contains the non-US spelling 'analysed', which should instead be 'analyzed'. |

ql/ql/test/queries/style/Misspelling/Test.qll

@@ -8,6 +8,8 @@ class PublicallyAccessible extends string {
 
   // should be argument
   predicate hasAgrument() { none() }
+
+  int getNum() { result = numOccurences }
 }
 
 /**

ql/ql/test/queries/style/UseInstanceofExtension/Foo.qll

@@ -22,6 +22,8 @@ class Inst3 extends string {
   Range range;
 
   Inst3() { this = range }
+
+  Range getRange() { result = range }
 }
 
 class Inst4 extends string {

ql/ql/test/queries/style/UseInstanceofExtension/UseInstanceofExtension.expected

@@ -1,4 +1,4 @@
 | Foo.qll:7:7:7:10 | Class Inst | Consider defining this class as non-extending subtype of $@. | Foo.qll:1:7:1:11 | Class Range | Range |
 | Foo.qll:15:7:15:11 | Class Inst2 | Consider defining this class as non-extending subtype of $@. | Foo.qll:1:7:1:11 | Class Range | Range |
 | Foo.qll:21:7:21:11 | Class Inst3 | Consider defining this class as non-extending subtype of $@. | Foo.qll:1:7:1:11 | Class Range | Range |
-| Foo.qll:27:7:27:11 | Class Inst4 | Consider defining this class as non-extending subtype of $@. | Foo.qll:1:7:1:11 | Class Range | Range |
+| Foo.qll:29:7:29:11 | Class Inst4 | Consider defining this class as non-extending subtype of $@. | Foo.qll:1:7:1:11 | Class Range | Range |

ql/ql/test/queries/style/UseSetLiteral/UseSetLiteral.expected

@@ -4,5 +4,5 @@
 | test.qll:62:7:65:14 | Disjunction | This formula of 4 comparisons can be replaced with a single equality on a set literal, improving readability. |
 | test.qll:68:7:71:13 | Disjunction | This formula of 4 comparisons can be replaced with a single equality on a set literal, improving readability. |
 | test.qll:74:7:77:13 | Disjunction | This formula of 4 comparisons can be replaced with a single equality on a set literal, improving readability. |
-| test.qll:87:3:90:9 | Disjunction | This formula of 4 predicate calls can be replaced with a single call on a set literal, improving readability. |
-| test.qll:128:3:134:3 | Disjunction | This formula of 4 comparisons can be replaced with a single equality on a set literal, improving readability. |
+| test.qll:89:3:92:9 | Disjunction | This formula of 4 predicate calls can be replaced with a single call on a set literal, improving readability. |
+| test.qll:130:3:136:3 | Disjunction | This formula of 4 comparisons can be replaced with a single equality on a set literal, improving readability. |

ql/ql/test/queries/style/UseSetLiteral/test.qll

@@ -81,6 +81,8 @@ class MyTest8Class extends int {
   predicate is(int x) { x = this }
 
   int get() { result = this }
+
+  string getS() { result = s }
 }
 
 predicate test9(MyTest8Class c) {