C# 15 (.NET 11 preview 5) encodes the closed modifier as
System.Runtime.CompilerServices.ClosedAttribute on the implicitly
abstract type plus CompilerFeatureRequired("ClosedClasses") on every
constructor; the BCL does not ship the attribute yet, so assemblies
declare their own copy or reference one from another assembly. The
decompiler now reconstructs the modifier from this encoding, gated on a
new C# 15 ClosedHierarchies setting. Exported projects state LangVersion
preview because the compiler does not accept 15.0 yet.
The pretty tests cover the definition side only: switch exhaustiveness
over a closed hierarchy is compile-time knowledge that leaves no trace
in the IL of consuming code.
Compiling "#dependency" test assemblies to a temp file left them
unresolvable while decompiling the main test assembly; they now land
next to the main output. With its dependency resolvable, Issue3684 no
longer needs the disambiguating base-class cast. The cross-assembly
fixture also exposed a latent NRE in RecordDecompiler when a record's
base type cannot be resolved.
Assisted-by: Claude:claude-fable-5:Claude Code
Completes the nullable migration for ICSharpCode.Decompiler/CSharp/Syntax: every
hand-written file now carries #nullable enable. The pattern-matching API
(INode/Pattern/PatternExtensions DoMatch/Match/IsMatch) takes a nullable 'other',
since matching legitimately compares a pattern against a missing child. Members
that genuinely return or accept null are annotated to match (AttributeSection's
target token, IAnnotatable.Annotation<T>, Statement/Expression.ReplaceWith,
SyntaxExtensions.GetNextStatement), and a latent null dereference in
Backreference.DoMatch is fixed.
Assisted-by: Claude:claude-opus-4-8:Claude Code
Comments and preprocessor directives were positional children interleaved
into the child list, and punctuation, keywords and operators were token-node
children. Add a leading/trailing trivia side-channel for comments and
directives, emit it from the output visitor, and re-home every comment
receiver onto it (including inside-block comments as comment-only empty
statements and undecodable attribute arguments as an ErrorExpression). With
locations and sequence points no longer sourced from token nodes, stop
reconstructing them on the locations path and delete CSharpTokenNode,
CSharpModifierToken and InsertSpecialsDecorator. The AST no longer carries
token children or positional comments; output is byte-identical.
Assisted-by: Claude:claude-opus-4-8:Claude Code
Christoph Wille
Siegfried Pammer
Peter Crabtree
Daniel Grunwald
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