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Author	SHA1	Message	Date
Siegfried Pammer	132b33e530	Cover the C# standard type-inference rules in TypeInferenceTests 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	2 months ago
Siegfried Pammer	e7f42d1b3c	Revive TypeInferenceTests from NRefactory 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	2 months ago

Siegfried Pammer

132b33e530

Cover the C# standard type-inference rules in TypeInferenceTests

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

2 months ago

Siegfried Pammer

e7f42d1b3c

Revive TypeInferenceTests from NRefactory

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

2 months ago

2 Commits (0f10ee1b9bd2b6c0cd6ba24e7735ff4be496fc3e)