ErrLookup › louthy/language-ext
louthy/language-ext
C# pure functional programming framework - come and get declarative! · C# · 1,746 source files
Analyzed at 2f0e362824 on 2026-09-15. 65 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| closed | exception | error | csharp, languageext, pipes, streaming, invalid-state |
| Key doesn't exist in map | exception | error | csharp, languageext, immutables, collection, argument-exception |
| NullReferenceException | exception | error | csharp, languageext, null, box |
| You can't map a tail call | exception | error | languageext, io-monad, tail-call, not-supported, dsl-internals |
| ToString method found for Object | exception | critical | reflection, trimming, object, dynamicmethod |
| Less than absolute zero | exception | error | argument-out-of-range, units-of-measure, temperature, validation |
| Unable to get ( , ) from change matrix | exception | error | patch, diff, index-out-of-range, csharp |
| AggregateException from collected inner errors | exception | error | csharp, languageext, async, async-enumerable, merge |
| Invalid iterator | exception | error | languageext, io-monad, repeat, iterator, invalid-state |
| InvalidOperationException | exception | error | reflection, equality, resolver, languageext |
| Constructor not found for type | exception | error | reflection, il-emission, constructor, generics |
| diff broken | exception | error | vector-clock, invariant, concurrency, csharp |
| must be of type Time | exception | error | csharp, languageext, icomparable, argument |
| OperationCanceledException | exception | warning | cancellation, ienumerable, cooperative-cancellation |
| Eq attribute should have a struct type that derives from… | exception | error | records, attributes, equality, csharp |
| Activity is null | exception | error | csharp, languageext, opentelemetry, tracing, null-reference |
| Key not found in Map | exception | error | csharp, languageext, map, key-not-found |
| Index outside the bounds of the list | exception | error | csharp, languageext, list, avl-tree, internal-invariant |
| Transaction not running | exception | error | stm, concurrency, transaction, csharp |
| Refs can only be written to from within a `sync` transaction | exception | error | stm, concurrency, transaction, csharp |
| must be of type Area | exception | error | argument-exception, units-of-measure, comparison, type-safety |
| must be of type VelocitySq | exception | error | csharp, languageext, icomparable, argument |
| An element with the same key already exists in the Map | exception | error | dotnet, set, duplicate-key, add |
| must be of type Length | exception | error | argument-exception, units-of-measure, comparison, type-safety |
| Tail calls can't transform in the `select` | exception | error | languageext, io-monad, tail-call, linq, select |
| Type is not a valid monoid | exception | error | csharp, languageext, monoid, validationt |
| Refs can only commute from within a transaction | exception | error | stm, concurrency, transaction, csharp |
| List is empty | exception | error | patch, diff, empty-collection, csharp |
| BottomException | exception | error | trampoline, monad, recursion, languageext |
| must be of type Velocity | exception | error | csharp, languageext, icomparable, argument |
| NotSupportedException | exception | error | csharp, languageext, seq, concat, notsupported |
| must be of type TimeSq | exception | error | csharp, languageext, icomparable, argument |
| Nil iterator has no head | exception | error | csharp, languageext, empty-sequence, async, iterator |
| InvalidCastException | exception | error | null, csharp, resources, io |
| Impossible | exception | error | megaparsec, parser, functor, pattern-matching, internal-invariant |
| Key already exists in map | exception | error | immutable-collections, duplicate-key, argumentexception |
| An element with the same key already exists in the set | exception | error | dotnet, set, duplicate-key, add |
| Key not found in set | exception | error | dotnet, set, key-not-found, lookup |
| Bug in MonadLaw or Monad.unsafeRecur. Contact language-ext… | exception | error | csharp, languageext, monad, laws, internal |
| You can't chain a tail call | exception | error | languageext, io-monad, tail-call, bind, not-supported |
| Don't use Equals - use either RecordType | exception | error | csharp, languageext, records, equality, deprecated |
| ArgumentOutOfRangeException | validation | error | arr, slice, argument-out-of-range, immutable-collections |
| IndexOutOfRangeException | exception | error | csharp, languageext, seq, lens, empty-collection |
| Cannot create an IterableNE from an empty span | exception | error | empty-span, non-empty-invariant, argument-exception, csharp |
| Can't create an IterableNE from an empty sequence | exception | error | empty-sequence, non-empty-invariant, argument-exception, csharp |
| must be of type Mass | exception | error | argument-exception, units-of-measure, comparison, type-safety |
| FoldBack* is currently not supported for IterableNE | exception | error | csharp, languageext, unsupported-operation, foldable |
| Append method found for StringBuilder | exception | error | |
| Ord attribute should have a struct type that derives from… | exception | error | csharp, languageext, records, attributes, reflection |
| must be of type Accel | exception | error | icomparable, argument-type, units-of-measure, languageext |
-2000000009 The IO monad is not in the monad-transformer stack or MonadIO.ToIO has not been… | error_code | error | csharp, languageext, monadio, io |
| NotSupportedException: Type.ToString() | exception | error | unsupported-operation, units-of-measure, arithmetic, temperature |
| ToString method found for StringBuilder | exception | error | |
| must be of type Temperature | exception | error | invalid-argument-value, type-mismatch, icomparable, temperature |
-2000000007 The IO monad is not in the monad-transformer stack or MonadIO.LiftIO has not… | error_code | error | csharp, languageext, monadio, io |
| Constructor not found for StringBuilder | exception | error | |
| Guard isn't initialised. It was probably created via new… | exception | error | guard, struct, initialization, invalid-operation |
| milliseconds must be a positive number. | validation | error | schedule, duration, argument |
| The minimum value for | validation | error | csharp, languageext, random, argument |
| ArgumentNullException | exception | error | csharp, languageext, list, null-argument |
| must be a Monoid | exception | error | csharp, languageext, validation, monoid, typeclass |
| s | exception | error | csharp, languageext, parsing, strings, ispanparsable |
| message | exception | error | csharp, languageext, prelude |
| Hashable attribute should have a struct type that derives… | exception | error | csharp, languageext, records, hashing, attributes |
| Option is not in a Some state | exception | error | csharp, languageext, option, invalidcast, monad |