fix(lsp): walk MatchClass sub-patterns as patterns so case captures bind

case Some(v): v is now declared and colored as a variable in the arm body.

App/lib/lsp/LspSymbols.vp

@@ -1122,8 +1122,17 @@ def _WalkPattern(pool: memhub.MemManager*, a: LspAnalysis*, scope: LspScope*,
     if k == ast.ASTKind.MatchClass:
         mc: ast.MatchClass* = (ast.MatchClass*)(node)
         _WalkExpr(pool, a, scope, mc.cls)
-        _WalkList(pool, a, scope, mc.patterns)
-        _WalkList(pool, a, scope, mc.kwd_patterns)
+        # Sub-patterns are patterns (captures bind variables), not plain expressions.
+        if mc.patterns is not None:
+            pi: int = 0
+            while pi < int(len(mc.patterns)):
+                _WalkPattern(pool, a, scope, mc.patterns.get(sizet(pi)))
+                pi += 1
+        if mc.kwd_patterns is not None:
+            pi = 0
+            while pi < int(len(mc.kwd_patterns)):
+                _WalkPattern(pool, a, scope, mc.kwd_patterns.get(sizet(pi)))
+                pi += 1
         return
     if k == ast.ASTKind.MatchAs:
         ma_p: ast.MatchAs* = (ast.MatchAs*)(node)