Fix: preserve switch case patterns in desugared output

The switch_entry rule was capturing switch_pattern wrapper nodes instead of
drilling into them to extract the actual pattern nodes. This caused patterns
from switch cases to be lost during desugaring.

Changed the pattern match from:
  (switch_entry pattern: (switch_pattern)* @pats ...)
to:
  (switch_entry pattern: (switch_pattern pattern: @pats)* ...)

This now correctly extracts the pattern field from each switch_pattern node,
ensuring that patterns from cases like 'case 1:' and 'case .circle(let r):'
are preserved in the switch_case AST nodes.

Updated control-flow.txt corpus outputs to reflect the new behavior.

Author: asgerf

unified/extractor/src/languages/swift/swift.rs

@@ -481,7 +481,7 @@ fn translation_rules() -> Vec<yeast::Rule> {
         ),
         // Switch entry with patterns and body
         rule!(
-            (switch_entry pattern: (switch_pattern)* @pats statement: _* @body)
+            (switch_entry pattern: (switch_pattern pattern: @pats)* statement: _* @body)
             =>
             (switch_case pattern: {..pats} body: (block stmt: {..body}))
         ),
@@ -491,8 +491,6 @@ fn translation_rules() -> Vec<yeast::Rule> {
             =>
             (switch_case body: (block stmt: {..body}))
         ),
-        // Switch pattern — unwrap to inner pattern
-        rule!((switch_pattern (pattern)* @inner) => {..inner}),
         // if case let x = expr — the pattern is taken as-is (no Optional wrapping)
         rule!(
             (if_let_binding "case" (value_binding_pattern) bound_identifier: @name _ @val)

unified/extractor/tests/corpus/swift/control-flow.txt

@@ -558,6 +558,7 @@ top_level
                       callee:
                         name_expr
                           identifier: identifier "print"
+              pattern: tuple_pattern "1"
             switch_case
               body:
                 block
@@ -569,6 +570,9 @@ top_level
                       callee:
                         name_expr
                           identifier: identifier "print"
+              pattern:
+                tuple_pattern "2"
+                tuple_pattern "3"
             switch_case
               body:
                 block
@@ -688,6 +692,7 @@ top_level
                       callee:
                         name_expr
                           identifier: identifier "print"
+              pattern: tuple_pattern ".circle(let r)"
             switch_case
               body:
                 block
@@ -701,6 +706,7 @@ top_level
                       callee:
                         name_expr
                           identifier: identifier "print"
+              pattern: tuple_pattern ".square(let s)"
           value:
             name_expr
               identifier: identifier "shape"