Each fixture test assembled Documentation/IdStringProbe.il separately,
and ilasm writes its output next to the input: on Windows the second
test failed with a sharing violation (0x80070020) because the first
test's PEFile still had the previous output open. The probe is now
assembled once per test run from a temp copy of the .il, so the tests
share one PEFile and nothing is written into the source tree, which
also makes the per-directory .gitignore unnecessary.
Assisted-by: Claude:claude-fable-5:Claude Code
IdStringMemberReference was its only implementation and left with the
ID string grammar parser; unlike the NRefactory-era type system, IMember
does not extend IMemberReference here, so nothing in the library
produces or consumes it anymore.
Assisted-by: Claude:claude-fable-5:Claude Code
A bound generic argument list without its closing brace fell off the
end of the string and silently produced an arity, making malformed ID
strings appear to parse and resolve to nothing instead of failing with
the documented ReflectionNameParseException. Also replaces the non-ASCII
punctuation in comments added by this branch with ASCII equivalents,
per the repository convention. Both raised by review on #3926.
Assisted-by: Claude:claude-fable-5:Claude Code
The C#/Roslyn-form ID of a member whose C++/CLI form differs can equal
the only key of a same-named sibling overload (char* vs signed char*).
Assemblies containing such overloads cannot come from the C# compiler,
so their xml files use the C++/CLI dialect, where that key documents
the sibling: falling back to the Roslyn form would show the sibling's
documentation for an undocumented member. GetIdStringCandidates now
omits the Roslyn form when a same-named sibling's C++/CLI form owns it,
so a lookup miss stays a miss.
Assisted-by: Claude:claude-fable-5:Claude Code
The recursive-descent parser for the full ID string grammar existed only
to feed the type-system-based FindEntity, while signatures were already
matched by regenerating candidate IDs; with two dialects a parser would
have to implement both grammars and stay in sync with the generator.
FindEntity now only decodes the structural skeleton - the declaring type
name and the member name - resolves the type, and narrows the members by
metadata name before the generate-and-compare step, falling back to an
unfiltered scan for keys whose name does not equal the metadata name
(a C++/CLI 'default' indexer). ParseTypeName, ParseMemberIdString and
their reference types (IdStringMemberReference,
GetPotentiallyNestedClassTypeReference) are removed.
Assisted-by: Claude:claude-fable-5:Claude Code
Member lookup compares regenerated ID strings, and with two dialects a
single mixed pass can resolve to the wrong member: the stripped
C#/Roslyn form of one member can equal the C++/CLI-dialect key of a
different member, e.g. C++ overloads differing only in a custom
modifier such as char* vs signed char*. FindMemberInType therefore
runs two passes over the whole member list, the more specific C++/CLI
form first, so an MSVC-written cref resolves to the member it names
instead of the first member whose stripped form happens to collide.
Assisted-by: Claude:claude-fable-5:Claude Code
The member keys in an xml doc file depend on the compiler that wrote it
(C# vs the MSVC C++/CLI dialect), so XmlDocumentationProvider's
entity-based lookup now tries each candidate form in order. The tooltip
path goes through the entity overload instead of building the key
itself, so the fallback lives in one place. The C++/CLI form is tried
first: wherever it differs it contains character sequences Roslyn never
writes, so it can only match MSVC-generated keys, while the stripped
Roslyn form of one member could match the key of a different member in
an MSVC-generated file.
Assisted-by: Claude:claude-fable-5:Claude Code
MSVC documents C++/CLI members with ECMA-372-style ID strings that
differ from Roslyn's in signatures: custom modifiers are rendered after
the modified type (a 'const int' parameter becomes
System.Int32!System.Runtime.CompilerServices.IsConst), arity markers
stay on generic instantiations (List`1{System.Int32}.Enumerator), and
the default indexed property is called 'default'. Roslyn ignores
modifiers entirely, so one generated string cannot match both
compilers' xml files: GetIdString keeps producing the C#/Roslyn form,
and the new GetIdStringCandidates additionally yields the C++/CLI form,
most specific first, for lookup code to try in order.
The dialect is pinned by IdStringProbe.il/.xml, the trimmed disassembly
of an MSVC-compiled probe assembly together with the unmodified xml MSVC
generated for it. Notable observed deviations from MSVC's documented
format: modreq is generated, but only modreq(IsVolatile) uses the
documented '|'; modreq(IsByValue) on conversion operator operands is
rendered with '!'.
Assisted-by: Claude:claude-fable-5:Claude Code
FindEntityInRelevantAssemblies now uses the metadata-level FindEntity
instead of parsing the ID string into type-system references and
resolving them per assembly. Two behaviors of the old path need
explicit handling because FindEntity only searches the modules it is
handed: reference assemblies are skipped so the search prefers an
assembly with a usable definition, and a member whose declaring type is
present only as a type forwarder is looked up in the assembly the
forwarder points to, which the assembly resolver may load on demand
(the old path got this through DecompilerTypeSystem resolution).
Assisted-by: Claude:claude-fable-5:Claude Code
Resolve an ID string to a (module, handle) pair by scanning metadata
directly: namespace/type-name splits are tried at every dot (the format
does not mark the boundary), nested types and type forwarders are
walked, and members are matched by regenerating each candidate's ID
string instead of parsing the signature portion, which keeps resolution
in sync with generation by construction. This gives navigation a
resolution path that needs no type system and works on assemblies
exactly as their metadata spells them. Inherent format limitations
(metadata names containing ID string special characters; function
pointer types rendering empty, so such overloads share an ID) are
documented on the method.
Assisted-by: Claude:claude-fable-5:Claude Code
Generate ID strings directly from metadata instead of the type system,
so callers holding only a MetadataFile and an EntityHandle do not need
to materialize a compilation first, and raw metadata names survive
verbatim. GetIdString(IEntity) stays as a thin wrapper over the new
implementation, keeping the published entity-based entry point intact.
The implementation is validated by a differential suite comparing every
symbol of a test corpus against Roslyn's GetDocumentationCommentId.
Corners pinned by those tests: generic arguments distribute to their
nesting level (Outer{A}.Inner{B}), op_CheckedExplicit carries the
~ReturnType suffix like the other conversion operators, and custom
modifiers are ignored like Roslyn ignores them (a virtual method's 'in'
parameter is modreq(InAttribute) but documented as T@). Array shapes
use the spec's lowerbound:size notation, covered by a hand-built
module, since C# cannot express non-default array bounds in signatures.
Assisted-by: Claude:claude-fable-5:Claude Code
* Make IProjectFileWriter implementations public and extensible
* Fix nullable error
* Fix delegate invocation to prevent race conditions
Refactored code to assign WriteCustomPropertyGroup and WriteCustomItemGroup delegates to local variables before null checks and invocation. This ensures thread safety by avoiding race conditions if the delegates are modified by other threads.
* Replace events with a GetCustomProperties virtual method
* Remove I prefix
With no configured solution, DotRush only auto-loads when the folder
contains exactly one solution file; this repo has several, so it shows
a picker and writes the chosen absolute path into .vscode/settings.json,
dirtying every fresh clone or worktree. The server resolves configured
entries against the workspace folder it is launched in, so a committed
relative path works everywhere and stops the write-back.
Assisted-by: Claude:claude-fable-5:Claude Code
Covers ref structs implementing interfaces (implicit, explicit, and
default-interface-method reimplementation, which CS9245 forces on every
ref struct implementer), the allows ref struct anti-constraint on
methods, classes, interfaces, delegates, local functions, iterators,
async methods, and capturing local functions, constraint combinations
(interface, IDisposable with using, unmanaged, struct, new()),
interface members invoked through a constrained T (instance, static
abstract factory, and default interface methods, which are callable
through T because implementers must always override them), scoped/ref/
in/out parameters of T, and call sites instantiating with Span/
ReadOnlySpan type arguments.
The test is green in all four Roslyn 4.14/latest debug/opt configs: the
decompiler already round-trips the gpAcceptByRefLike flag into
"allows ref struct" clauses and re-emits ref struct interface
implementations correctly. One cosmetic quirk is pinned as-is: calls
whose type arguments are ref structs are printed with explicit type
arguments and a declaring-type qualifier even within the declaring
class, because type-argument inference validation does not accept ref
struct type arguments; the output remains compilable and semantically
identical.
Assisted-by: Claude:claude-fable-5:Claude Code
The TypeDef table view derived FieldList/MethodList from the computed
member ranges (TypeDefinition.GetFields/GetMethods), and the MethodDef
view derived ParamList the same way; their FirstOrDefault is a nil
handle for an empty range, so memberless types and parameterless
methods displayed row 0. The stored column value is never 0: it is the
running list position, i.e. the next row's first member or one past the
member table's end. Read the raw columns instead, relative to the row
end so the widths of the preceding string-heap, blob and coded-index
columns need not be re-derived, and sized by the table the column
actually indexes (the FieldPtr/MethodPtr/ParamPtr indirection when
present). EventMap and PropertyMap already read their list columns from
the raw rows. Tooltips explain the empty-list-start semantics; rows
with members behave as before.
Assisted-by: Claude:claude-fable-5:Claude Code
Toggle folding picked the innermost fold containing the offset, but a
member's logical region is fragmented: the body fold starts at the
opening brace, the XML documentation has an independent fold, and the
header line belongs to neither, so toggling there collapsed the whole
enclosing type. Visual Studio's source editor keeps documentation
regions independent, but its metadata-as-source view treats the
member's leading trivia as one hideable unit; for a read-only
decompiler view the grouped behavior is the intuitive one.
The writer now records where an entity declaration begins, and the
definition's fold carries that logical start. Toggling targets the fold
whose logical region innermost-contains the offset, so the header line
targets the member rather than the type, and leading documentation
folds follow the member fold's new state. Inside the documentation the
doc fold itself is the innermost region and still toggles alone.
Toggle all folding now follows Visual Studio's Toggle All Outlining
parity: a mixed state expands everything, a uniform state flips.
Assisted-by: Claude:claude-fable-5:Claude Code
Clicking a local variable highlights its occurrences, but clicking a
member or type always navigated away, so there was no way to see all
uses of a member within the current view. With the new display setting
enabled (off by default, as discussed in the issue), a single click on
a member or type reference paints every occurrence in the view using
the local-reference highlight infrastructure, and Ctrl+Click performs
the navigation. Opcode references keep navigating on plain click.
Matching occurrences are compared by definition token and module
rather than by Equals, because a use site carries a specialized member
instance while the declaration carries the definition; this also fixes
the analyzer-driven highlight for specialized members. Unresolved
entity references from the IL and metadata views are compared
structurally to avoid building a type system per click.
The hand cursor promises navigation, so it is shown only when a click
would actually navigate: cursor queries factor in the setting and the
Ctrl state, and Ctrl presses/releases while hovering a reference
repaint the cursor via top-level key handlers, since keyboard focus is
usually elsewhere while hovering.
Assisted-by: Claude:claude-fable-5:Claude Code
Decompiling one method or property previously required decompiling its
whole type and searching the output, which is wasteful for scripted and
agent-driven use against large assemblies. The new -m|--member option
accepts an XML documentation id string (the syntax of compiler-generated
documentation files and of the UI's --navigateto option) or a metadata
token in 0x06000005 form, resolves it against the main module (with a
bounds check for tokens and distinct error messages for malformed ids,
unknown members, and members of other modules), and prints just that
member through the engine's single-member decompilation path.
The tests seed a new ICSharpCode.ILSpyCmd.Tests project (part of the
XPlat and Desktop solution filters and of the per-project CI test
steps), driving the real Main in-process via InternalsVisibleTo, so
future ilspycmd features have a dedicated home for CLI tests.
Assisted-by: Claude:claude-fable-5:Claude Code
The explicit 15-second budget timed out on a loaded Windows Release CI
runner (a different test of this fixture on each attempt, while the
sibling workflow run passed the same head). The waits are
completion-bounded - the predicate observes the end of an async
re-decompile - so the 60-second Waiters default costs nothing when
healthy and only converts runner slowness from a red run into a longer
green one.
Assisted-by: Claude:claude-fable-5:Claude Code
Filtering and un-filtering the Debug Steps tree re-arranges rows around
the selection: matches surface under newly expanded groups and the
restore step re-opens the selected step's ancestors. Without scrolling,
the selected row regularly ended up outside the viewport even though it
was expanded into view. The ViewModel now raises a reveal request after
each filter pass while a visible step is selected; the View answers it
by centering the row, because scrolling needs containers and the
ScrollViewer. The measurement anchors on the row header since an
expanded group's container spans its whole subtree, and it runs at
Loaded dispatcher priority so freshly expanded containers have valid
geometry.
Assisted-by: Claude:claude-fable-5:Claude Code
The filter drove every row's IsExpanded from the single IsFiltering flag
via a TreeViewItem style setter. Expansion lived nowhere else: user
gestures (expander arrow, double-tap, arrow keys) all write the property
with SetCurrentValue, which the style binding overwrites on every flip
of the flag. Starting a filter therefore destroyed the expansion state
the user had built up, and clearing it collapsed the whole tree,
burying the still-selected row under collapsed groups.
Row state (visibility + expansion) now lives on a StepNodeViewModel
wrapper per step, two-way bound from the style, so gestures persist in
the view-model. A filter session snapshots expansion on entry, hides
non-matches and opens only the paths to matches while typing, and on
exit restores the snapshot and re-expands the selected step's ancestors
so the selection stays visible. Wrapping is skipped for reference-equal
step lists because step replays re-report the same run and a rebuild
would wipe the state mid-navigation.
Assisted-by: Claude:claude-fable-5:Claude Code
The netcore-2.2 reference set consists of the shared framework's facade
assemblies split across many files, and vbc only binds special types
like System.Void from an assembly that defines them rather than
following type forwards, so without an implicit SDK it needs the same
reference list as the C# side. The VB runtime must come from the legacy
reference set: before .NET Core 3.0 there is no
Microsoft.VisualBasic.Core.dll and the core build of the VB runtime is
a trimmed-down subset (no UBound etc.). Referencing the target
framework's own Microsoft.VisualBasic facade alongside that -vbruntime
choice is a BC32210 identity conflict, so it is dropped from both the
default reference list and the ReferenceVisualBasic flag handling.
All of this applies only where vbc runs without its implicit desktop
SDK path, i.e. off Windows; on Windows vbc.exe keeps the plain
reference list that already worked.
Assisted-by: Claude:claude-fable-5:Claude Code
The Roslyn 1.3.2 and 2.10.0 configurations were excluded from the
compiler matrix on non-Windows platforms because Microsoft.Net.Compilers
only ships .NET Framework executables. Both can be enabled:
- Roslyn 2.10.0 has a dotnet-hosted sibling package,
Microsoft.NETCore.Compilers, whose tools/bincore/csc.dll runs on the
installed runtime with --roll-forward LatestMajor (its runtimeconfig
pins the out-of-support .NET Core 2.0). Fetched on non-Windows into
the version's tools/bincore directory; GetCSharpCompiler probes for a
direct csc.dll next to the installed path in addition to the
bincore/ subfolder layout of the newer toolset packages.
- Roslyn 1.3.2 has no .NET build; when a mono executable is found on
the PATH, it is kept in the matrix and WrapCompiler hosts the .exe
compilers through mono. Because the native DiaSymReader needed for
Windows PDBs is unavailable there, GeneratePdb requests portable
PDBs on non-Windows (Roslyn 2.x+ falls back on its own, 1.x needs
the explicit -debug:portable).
The mcs configurations stay excluded: the bundled mcs 2.6.4 needs the
Reflection.Emit COMPILER_ACCESS mode that current Mono runtimes no
longer implement. Old-compiler configurations also stay excluded from
correctness-style fixtures: their output targets .NET Framework or
.NET Core 2.2, which the runners cannot execute here.
Microsoft.NETCore.Compilers-2.10.0.nupkg should be added to
ILSpy-tests/nuget to keep the fetch offline-capable.
Assisted-by: Claude:claude-fable-5:Claude Code
The override modifier already navigates to the overridden member and
constructor initializers link this/base to the invoked constructor, but
the primary expressions carried no reference at all. Matching IDE
go-to-definition behavior, 'this' now references the current type and
'base' the base type; both directions are added together deliberately,
linking only 'base' would make the two keywords behave inconsistently.
Assisted-by: Claude:claude-fable-5:Claude Code
The analyzer panel could only walk downward (Overridden By, Implemented
By); finding what a member overrides required manually climbing base
types. The upward interface direction already exists as the Implements
analysis, so this adds the missing base-class direction as its dual.
The analyzer walks the override chain member by member via
InheritanceHelper.GetBaseMember instead of collecting all
signature-equal base members, so it stops at 'new virtual' shadow
boundaries, which hide any further base members from overriding. No
assembly-scope scan is needed; the walk is a direct type-system lookup.
Assisted-by: Claude:claude-fable-5:Claude Code
The chain cases in the fixture route T : TOuter through a class-level
type parameter; the variant where the dependency target is a sibling
method type parameter (M<T, U> with T : U) was uncovered. It pins the
same alignment from a different angle: csc rejects 'class' with CS8665
when U is merely class-constrained and requires 'default', but accepts
'class' when U carries a class-type constraint, matching what the
tri-state IsReferenceType derives. Both directions were verified
against csc before adding the expected output.
Assisted-by: Claude:claude-fable-5:Claude Code
Corrupt or hand-written metadata can contain a property with no
MethodSemantics rows at all. MetadataTypeDefinition.Properties already
skips properties with neither a visible getter nor setter, so neither
the parameterized-property path nor the ordinary one ever sees them;
the accessor-method emission also tolerates a missing accessor by
construction. Pin that with an ILPretty case containing both a
parameterized and an ordinary accessor-less property.
Assisted-by: Claude:claude-fable-5:Claude Code
The renamed-Implements case exposed a gap: the accessor-method
declarations did not include the explicit-interface-implementation
forwarders generated from .override directives, so decompiled types did
not implement their interfaces and same-name implementations lost their
interface mapping. DecompileParameterizedProperty now emits the same
forwarder stubs as the ordinary method path.
Assisted-by: Claude:claude-fable-5:Claude Code
The main tree, tooltips, and search results once showed the parameter
list of a parameterized property; the ambience lost that when property
rendering went through the converted AST node, whose C# property syntax
cannot carry parameters. Take the parameter list from the symbol
instead and render it in parentheses (matching VB.NET usage syntax and
distinguishing these properties from indexers).
Assisted-by: Claude:claude-fable-5:Claude Code
The compiler-generated documentation file contains a P: entry for a
parameterized property, but its accessors are emitted as ordinary
methods, whose M: id has no documentation entry. Fall back to the
owning property's documentation both when inserting XML documentation
into decompiled output (on the first accessor only, to avoid
duplicating it) and in the text view's tooltip (for either accessor).
Assisted-by: Claude:claude-fable-5:Claude Code
C# cannot declare a named property with parameters: only the type's
default member gets indexer syntax, and reusing it via [IndexerName]
collapses for types with several differently-named indexed properties,
static properties, or explicit interface implementations. Emitting the
accessors as ordinary methods is the only fully general compilable
form, matches how C# consumes such properties (Roslyn exposes the
accessors of properties it cannot bind as regular methods, the same
pattern C# 14 made user-facing for extension-member disambiguation),
and round-trips call sites to identical IL. Call sites already lower
to direct accessor calls.
The property-level attributes are kept on the first accessor under the
'property:' attribute target: it is not valid on methods, so csc emits
nothing for it (CS0657 warning) and recompilation neither loses the
attributes from the source nor misapplies them to the accessor. A
comment on the first accessor documents the deliberate deviation.
Visual Studio's metadata-as-source view drops such properties'
attributes entirely.
The assembly tree and tooltips are unaffected: they keep rendering the
property node with its parameter list. Known limitation, inherent to
any C# projection: recompiling the output produces plain methods, so
VB.NET consumers of the recompiled assembly lose property syntax.
Assisted-by: Claude:claude-fable-5:Claude Code
C# has no syntax for named properties with parameters, so the expected
output declares the accessors as ordinary methods, keeps the
property-level attributes under the inert 'property:' attribute target
(ignored by csc with CS0657), and consumes the properties through
direct accessor calls, which Roslyn permits exactly for properties
whose shape C# cannot bind. Red against the current decompiler, which
emits a parameterless property whose body references the vanished
parameters.
Assisted-by: Claude:claude-fable-5:Claude Code
The foreach pattern was only matched against using instructions, but
the compiler emits no using/try-finally at all when the enumerator's
static type can never require disposal: a struct or a sealed class
that does not implement IDisposable (SerializationInfoEnumerator in
the issue's example). Such loops stayed while loops.
Recognize the bare 'enumerator = x.GetEnumerator(); while
(enumerator.MoveNext())' shape during statement building and reuse the
existing foreach transformation core for it. The transformation is
restricted to exactly the cases where recompilation would produce the
same IL: the enumerator type rules above (ref structs are excluded
because of pattern-based disposal), a single-store enumerator variable
unused outside the loop, and synchronous enumeration only, since async
enumerators are always IAsyncDisposable.
Assisted-by: Claude:claude-fable-5:Claude Code
Walks the inference algorithm of the standard (draft-v11, 12.6.3) and
adds a test per rule that the revived NRefactory suite did not already
exercise: exact inference for ref parameters and its non-applicability
of the base-type walk, explicit lambda parameter types, exact/upper
bound inference through arrays, nullables and variance nesting, the
unique-base-type restriction, value-type elements forcing exact
inference, conflicting exact bounds, and best common type.
Two rules are pinned as ignored tests because the implementation does
not follow the standard yet: a value argument to an 'in' parameter
infers no bound (12.6.3.7 wants a lower-bound inference), and tuple
literals are not inferred elementwise (12.6.3.7/12.6.3.8). Both tests
assert the csc-verified result and should go green when the rules are
implemented.
Nullable unwrapping in exact and upper-bound inferences needs no
dedicated code path in this implementation: T? is represented as the
constructed type Nullable<T>, so the constructed-type case already
produces the elementwise exact inference the standard asks for; the
new tests pin that equivalence. Function-pointer inference rules and
the explicit-return-type inference of 12.6.3.15 remain untested: the
former needs a MetadataModule to construct FunctionPointerType, the
latter is not representable in LambdaResolveResult.
Assisted-by: Claude:claude-fable-5:Claude Code
The direct unit tests for TypeInference were lost when the NRefactory
sources were replaced by the NuGet package (e88120cb4); since then the
class had no dedicated coverage and ConversionTests still pointed to a
test that no longer existed. Ported to the current type system API and
NUnit constraint asserts. The two tests NRefactory ignored on .NET 4.5
now pin the covariant IReadOnlyList<T> results, since the test
compilation uses the 4.5-era reference mscorlib; the common-subtype list
test gains the ReadOnlyCollectionBuilder<T> candidates contributed by
System.Core, which the NRefactory compilation did not reference.
Also includes the seven tests that only exist in upstream
icsharpcode/NRefactory (async lambdas, NullablePick, CoContraPick,
bug 9300, user-defined-conversion bounds). Upstream wrote them against
its source-based resolver harness, which this repo does not have, so
they are reexpressed as direct InferTypeArguments calls using mock
lambdas and helper types declared in the test assembly. Upstream's
InferFromImplicitAsyncLambda was missing its [Test] attribute and never
actually ran; here it does.
Assisted-by: Claude:claude-fable-5:Claude Code
allows ref struct is inherited implicitly, so restating it on an override is
CS0460 even alongside a legal disambiguator. Roslyn still re-emits the byreflike
flag on the override's own type parameter, and the general constraint printer
turns that flag back into source, so the disambiguator stays legal only as long
as it is built separately. Cover a C# 13 base whose annotated and plain methods
both allow ref structs.
Assisted-by: Copilot:claude-opus-5:GitHub Copilot CLI
IsReferenceType is a bool?, so choosing between class, default and no
constraint at all is a three-state decision. Spelling those states out keeps
that visible where the choice is made, rather than leaving it implied by a
comparison against true.
Assisted-by: Copilot:claude-opus-5:GitHub Copilot CLI
A class-type constraint such as Stream or Delegate sets no
ReferenceTypeConstraint flag, so keying the disambiguator off that flag gave
those overrides the default constraint, which is CS8822, and the output still
did not recompile. The restated disambiguator leaves no metadata trace of its
own, so the choice has to follow from whether the inherited constraints make
the type parameter a reference type, a value type, or neither.
Matching the annotated type parameters by identity rather than by owner kind
and index also keeps a specialized signature from contributing a foreign type
parameter that happens to share an index.
Assisted-by: Copilot:claude-opus-5:GitHub Copilot CLI
Dumping the implicit/explicit classification of all pairs from a 120-type
universe and diffing it against what csc actually compiles surfaced two
divergences (16 affected pairs), both proven by a compiling-and-running
snippet and captured here as ignored known-bug tests:
1. Nullable conversions derived from tuple conversions are missing:
csc accepts "(long, object)? a = t;" for t of type (int, string) as
well as the lifted and explicit forms, CSharpConversions returns None.
The ECMA spec's 10.6.1 does not list tuple conversions as liftable,
so this is a case of Roslyn exceeding the spec.
2. An explicit user-defined conversion to a nullable target is rejected
when the operator result additionally needs an explicit numeric
conversion: csc accepts "(int?)new ImplicitToLong()" (operator to
long, then explicit long -> int?), CSharpConversions returns None.
The same sweep confirmed the SByte..Decimal TypeCode range in
ImplicitEnumerationConversion is correct: csc accepts zero constants of
any numeric type (0.0, 0f, 0m) for enum conversion and rejects '\0',
matching the implementation exactly.
Assisted-by: Claude:claude-fable-5:Claude Code
Audit the conversion test suites against the conversions chapter of the
draft-v8 C# standard and add tests for every rule that had none:
exhaustive implicit/explicit numeric conversion matrix, tuple/ValueTuple
and nullable-annotation identity, interpolated-string / throw-expression /
tuple-literal conversions, the boxing rule set including variance-based
boxing and unboxing, delegate-to-System.Delegate and IReadOnlyList<T>
reference conversions, type-parameter variance and effective-base-class
casts, generic method groups (inference, explicit type arguments, no
inference from the return type), the anonymous-function compatibility
checks CSharpConversions performs itself (via a LambdaResolveResult test
double), standard-conversion exclusion of user-defined operators, and
operators declared in base classes of the source type.
Two rules are implementation gaps rather than test gaps and get ignored
placeholder tests naming the gap: default literal conversions (10.2.16)
are an explicit TODO in CSharpConversions, and switch expressions
(10.2.18) have no ResolveResult representation. The full
section-by-section map is in
Analyses/ILSpy/2026-07-24_conversions-spec-coverage.md.
Assisted-by: Claude:claude-fable-5:Claude Code
Convert the commented-out block in ExplicitConversionsTest the same way as
the implicit ConversionTest block: type-parameter casts via
DefaultTypeParameter with cross-referencing constraints, user-defined
operators as fixture types in the test assembly, constant sources via
ConstantResolveResult. The rr.Input asserts of the originals were resolver
artifacts and are dropped; UseDefinedExplicitConversion_Lifted instead
exercises the ResolveResult-based ExplicitConversion entry point.
Also extend PreferAmbiguousConversionOverReferenceConversion with the
overload-resolution half of the original NRefactory test (the ambiguous
conversion must not prevent M(BB) from being chosen over M(object)), which
the first revival pass had reduced to the conversion classification alone.
Assisted-by: Claude:claude-fable-5:Claude Code
The block of tests inherited from NRefactory's ConversionsTest was
commented out because it depended on ResolverTestBase (full AST +
CSharpResolver). Rewrite all of them against CSharpConversions directly:
hand-built MethodGroupResolveResults over fixture types compiled into the
test assembly (extension methods injected via the internal
extensionMethods field), DefaultTypeParameter instances with
cross-referencing constraints, and metadata-backed fixture interfaces for
the ExpansiveInheritance termination test.
Two deviations from the NRefactory originals:
MethodGroupConversion_RefArgumentObjectVsDynamic now expects a valid
conversion, because object/dynamic mismatch in a ref parameter is an
identity conversion and current csc accepts the assignment (verified);
PreferUserDefinedConversionOverReferenceConversion resolved an invocation,
so it is recast as an OverloadResolution test over FakeMethod candidates.
Assisted-by: Claude:claude-fable-5:Claude Code
Override constraints are normally inherited and omitted, but nullable type
parameters still require class or default to distinguish annotations from
Nullable<T>. Derive that legal discriminator from the method metadata.
Assisted-by: Copilot:gpt-5.6-sol:GitHub Copilot CLI
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Copilot-Session: 86d2918e-5a24-48b4-9a86-41d331ec3720
Siegfried Pammer
ds5678
Christoph Wille
dependabot[bot]
Sebastien Lebreton