Compilation fails sometimes for path named "/s/"

Description

I have found interesting edge case - in some cases compilation fails when path name is specific.

I've provided a file with single path /s/ which fails during compilation. If I change the name of that path to /r/ compilation works fine.

I'm using a Docker container built by running docker build . -t restler:latest using latest restler-fuzzer code (at revision c0c7c53f4fe7daedb381b1d0bfd4833ddc81b40a).

Steps to reproduce

Create a file openapi.json with contents:

{
    "openapi": "3.0.2",
    "info": {
        "title": "Demo Blog Server",
        "version": "0.1.0"
    },
    "paths": {
        "/s/": {
            "get": {
                "summary": "Foo",
                "operationId": "Bar",
                "parameters": [{
                    "name": "Baz",
                    "in": "query"
                }],
                "responses": {
                    "200": {
                        "description": "Successful Response"
                    }
                }
            }
        }
    }
}

During preparation of this minimal reproduction, I've found that adding at leas one parameter is required to force a fail during compilation.

Execute Restler compile --api_spec openapi.json.

Expected results

Compilation suceeds.

Actual results

Compilation fails with:

Starting task Compile...

ERROR: Compiler failed. See logs in /app/Compile directory for more information.

Task Compile failed.
Collecting logs...

Compile/StdErr.txt file contents:

Unhandled exception. System.AggregateException: One or more errors occurred. (Index was outside the bounds of the array.)
 ---> System.IndexOutOfRangeException: Index was outside the bounds of the array.
   at System.String.get_Chars(Int32 index)
   at Restler.ApiResourceTypes.ApiResource.getConvention(String str) in /src/compiler/Restler.Compiler/ApiResourceTypes.fs:line 156
   at Restler.ApiResourceTypes.ApiResource.getTypeWords(String name) in /src/compiler/Restler.Compiler/ApiResourceTypes.fs:line 176
   at Restler.ApiResourceTypes.ApiResource.getCandidateTypeNames() in /src/compiler/Restler.Compiler/ApiResourceTypes.fs:line 194
   at Restler.ApiResourceTypes.ApiResource..ctor(RequestId requestId, ResourceReference resourceReference, FSharpOption`1 namingConvention, PrimitiveType primitiveType) in /src/compiler/Restler.Compiler/ApiResourceTypes.fs:line 183
   at Restler.Dependencies.getConsumer@909(ParameterKind parameterKind, IEnumerable`1 globalAnnotations, RequestId requestId, FSharpOption`1 namingConvention, FSharpMap`2 annotatedRequests, String parameterName, String resourceName, FSharpList`1 resourceAccessPath, FSharpOption`1 primitiveType) in /src/compiler/Restler.Compiler/Dependencies.fs:line 932
   at Restler.Dependencies.getParameterDependencies(ParameterKind parameterKind, IEnumerable`1 globalAnnotations, Tuple`2[] requestData, RequestId requestId, RequestParameter requestParameter, FSharpOption`1 namingConvention)
   at Restler.Dependencies.getParameterConsumers@1116-1.Invoke(RequestParameter p) in /src/compiler/Restler.Compiler/Dependencies.fs:line 1117
   at Microsoft.FSharp.Collections.Internal.IEnumerator.map@75.DoMoveNext(b& curr) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 78
   at Microsoft.FSharp.Collections.Internal.IEnumerator.MapEnumerator`1.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 64
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.takeOuter@273[T,TResult](ConcatEnumerator`2 x, Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 274
   at Microsoft.FSharp.Core.CompilerServices.RuntimeHelpers.takeInner@266[T,TResult](ConcatEnumerator`2 x, Unit unitVar0) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 268
   at Microsoft.FSharp.Collections.SeqModule.DistinctBy@1098.GenerateNext(IEnumerable`1& next) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 1099
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.MoveNextImpl() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 371
   at Microsoft.FSharp.Core.CompilerServices.GeneratedSequenceBase`1.System-Collections-IEnumerator-MoveNext() in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seqcore.fs:line 403
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at Microsoft.FSharp.Collections.SeqModule.ToArray[T](IEnumerable`1 source) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\seq.fs:line 825
   at Restler.Dependencies.generatedSuffixes@1378.Invoke(Tuple`2 tupledArg) in /src/compiler/Restler.Compiler/Dependencies.fs:line 1380
   at Microsoft.FSharp.Collections.ArrayModule.Parallel.Map@1317-3.Invoke(Int32 i) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\array.fs:line 1318
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`1.<ForWorker>b__1(RangeWorker& currentWorker, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.<>c__DisplayClass19_0`1.<ForWorker>b__1(RangeWorker& currentWorker, Int32 timeout, Boolean& replicationDelegateYieldedBeforeCompletion)
   at System.Threading.Tasks.TaskReplicator.Replica.Execute()
   --- End of inner exception stack trace ---
   at System.Threading.Tasks.TaskReplicator.Run[TState](ReplicatableUserAction`1 action, ParallelOptions options, Boolean stopOnFirstFailure)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
--- End of stack trace from previous location ---
   at System.Threading.Tasks.Parallel.ThrowSingleCancellationExceptionOrOtherException(ICollection exceptions, CancellationToken cancelToken, Exception otherException)
   at System.Threading.Tasks.Parallel.ForWorker[TLocal](Int32 fromInclusive, Int32 toExclusive, ParallelOptions parallelOptions, Action`1 body, Action`2 bodyWithState, Func`4 bodyWithLocal, Func`1 localInit, Action`1 localFinally)
   at System.Threading.Tasks.Parallel.For(Int32 fromInclusive, Int32 toExclusive, Action`1 body)
   at Microsoft.FSharp.Collections.ArrayModule.Parallel.Map[T,TResult](FSharpFunc`2 mapping, T[] array) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\array.fs:line 1317
   at Restler.Dependencies.extractDependencies(Tuple`2[] requestData, IEnumerable`1 globalAnnotations, MutationsDictionary customDictionary, Boolean queryDependencies, Boolean bodyDependencies, Boolean headerDependencies, Boolean allowGetProducers, Boolean dataFuzzing, FSharpMap`2 perResourceDictionaries, FSharpOption`1 namingConvention) in /src/compiler/Restler.Compiler/Dependencies.fs:line 1376
   at Restler.Compiler.Main.generateRequestGrammar(FSharpList`1 swaggerDocs, MutationsDictionary dictionary, Config config, FSharpList`1 globalExternalAnnotations, FSharpList`1 userSpecifiedExamples) in /src/compiler/Restler.Compiler/Compiler.fs:line 1312
   at Restler.Workflow.generateGrammarFromSwagger(String grammarOutputDirectoryPath, FSharpOption`1 swaggerDoc, FSharpOption`1 specMetadata, Config config) in /src/compiler/Restler.Compiler/Workflow.fs:line 182   at Restler.Workflow.generateRestlerGrammar(FSharpOption`1 swaggerDoc, Config config) in /src/compiler/Restler.Compiler/Workflow.fs:line 290
   at Program.main(String[] argv) in /src/compiler/Restler.CompilerExe/Program.fs:line 43

Environment details

command executed in container built by running docker build . -t restler:latest using latest restler-fuzzer code (at revision c0c7c53f4fe7daedb381b1d0bfd4833ddc81b40a).
Python 3.10.10
RESTler version: 9.1.1

microsoft / restler-fuzzer