Merge pull request #14567 from github/redsun82/swift-case-variables

Swift: clean up `VarDecl`, `NamedPattern` and `SwitchStmt` interactions

Author: MathiasVP

swift/downgrades/7c17e1f4b2d30f2da05bfa667c621ddd418eb151/named_patterns.ql

@@ -0,0 +1,16 @@
+// Change the second column in named_patterns from a @var_decl to a string
+class NamedPattern extends @named_pattern {
+  VarDecl getVarDecl() { named_patterns(this, result) }
+
+  string toString() { none() }
+}
+
+class VarDecl extends @var_decl {
+  string getName() { var_decls(this, result, _) }
+
+  string toString() { none() }
+}
+
+from NamedPattern np, VarDecl d, string name
+where d = np.getVarDecl() and name = d.getName()
+select np, name