Fix Parameters:value handling to prevent unmatched braces error

altshfmt

@@ -174,6 +174,10 @@ altshfmt() {
           /^[[:space:]]*('"$SHELLSPEC_DSL_ONLINE_DATA"').*/ {
             next
           }
+          /^[[:space:]]*(Parameters:value)([[:space:]].*|$)/ {
+            # Parameters:value is a standalone construct and does not need braces
+            next
+          }
           /^[[:space:]]*('"$SHELLSPEC_DSL_BEGIN"')([[:space:]].*|$)/ {
             while(match($0, /.*\\$/)) { getline; print }
             print "{ # @@altsh@@begin"

spec/altshfmt_spec.sh

@@ -201,4 +201,52 @@ Describe "altshfmt"
       The output should eq "1: arg1 arg2 -l"
     End
   End
+
+  # Regression tests
+  Describe "Parameters:value handling"
+    Context "when Parameters:value is used in shellspec"
+      Data
+        #|#!/bin/bash
+        #|
+        #|Parameters:value aarch64 ppc64le s390x x86_64
+        #|
+        #|It 'is simple'
+        #|  When call echo "$1"
+        #|  The output should eq "$1"
+        #|End
+      End
+
+      It "formats without syntax errors"
+        When call altshfmt
+        The status should be success
+        The output should include "Parameters:value aarch64 ppc64le s390x x86_64"
+      End
+
+      It "produces valid shell syntax"
+        When call bash -c './altshfmt | bash -n'
+        The status should be success
+      End
+    End
+
+    Context "when other Parameters variants are used"
+      Data
+        #|#!/bin/bash
+        #|
+        #|Parameters:block
+        #|  foo bar
+        #|End
+        #|
+        #|It 'test'
+        #|  echo hello
+        #|End
+      End
+
+      It "still formats Parameters:block correctly"
+        When call altshfmt
+        The status should be success
+        The output should include "Parameters:block"
+        The output should include "foo bar"
+      End
+    End
+  End
 End