Bicep file referencing an exported type used in the outputs of the file containing the custom type can crash compiler

[joetossell]

Bicep version
Bicep CLI version 0.32.4 (b326faa)

Describe the bug
Scenario:

• A type is exported from someType.bicep and is explicitly imported into consumer.bicep
• There is an output in someType.bicep that uses the exported type
• The output has the same name as the exported type

When compiled using az bicep build -f .\consumer.bicep the compiler throws an unhandled exception:

Unhandled exception. System.InvalidOperationException: Sequence contains more than one element
   at System.Linq.ThrowHelper.ThrowMoreThanOneElementException()
   at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1, Boolean& )
   at System.Linq.Enumerable.Single[TSource](IEnumerable`1)
   at Bicep.Core.Emit.CompileTimeImports.ImportClosureInfo.FindSymbolNamed(String nameOfSymbolSought, SemanticModel model)
   at Bicep.Core.Emit.CompileTimeImports.ImportClosureInfo.CalculateImportClosure(SemanticModel model, IntraTemplateSymbolicReferenceFactory referenceFactory)
   at Bicep.Core.Emit.CompileTimeImports.ImportClosureInfo.Calculate(SemanticModel model)
   at Bicep.Core.Emit.EmitterContext.<>c__DisplayClass1_0.<.ctor>b__0()
   at System.Lazy`1.PublicationOnlyViaFactory(LazyHelper)
   at System.Lazy`1.CreateValue()
   at System.Lazy`1.get_Value()
   at Bicep.Core.Emit.EmitterContext.get_ImportClosureInfo()
   at Bicep.Core.Emit.TemplateWriter.GenerateTemplateWithoutHash(PositionTrackingJsonTextWriter jsonWriter)
   at Bicep.Core.Emit.TemplateWriter.Write(SourceAwareJsonTextWriter writer)
   at Bicep.Core.Emit.TemplateEmitter.<>c__DisplayClass8_0.<Emit>b__0()
   at Bicep.Core.Emit.TemplateEmitter.EmitOrFail(Func`1 write)
   at Bicep.Core.Emit.TemplateEmitter.Emit(TextWriter textWriter)
   at Bicep.Core.Emit.CompilationEmitter.Template(SemanticModel model)
   at Bicep.Core.Emit.CompilationEmitter.Template()
   at Bicep.Cli.Services.OutputWriter.TemplateToFile(Compilation compilation, Uri outputUri)
   at Bicep.Cli.Commands.BuildCommand.RunAsync(BuildArguments args)
   at Bicep.Cli.Program.RunAsync(String[] args, CancellationToken cancellationToken)
   at Bicep.Cli.Program.<>c__DisplayClass3_0.<<Main>b__0>d.MoveNext()
--- End of stack trace from previous location ---
   at Bicep.Cli.Program.RunWithCancellationAsync(Func`2 runFunc)
   at Bicep.Cli.Program.Main(String[] args)
   at Bicep.Cli.Program.<Main>(String[] args)

To Reproduce

someType.bicep

@export()
type someType = {}

output someType someType = {}
// output st someType = {} // this works!

consumer.bicep

import {someType} from 'someType.bicep'

run

az bicep build -f consumer.bicep

Additional context

For anyone else facing this error there are a number of options:

• Use import * as st from 'someType.bicep'
• Ensure the name of the output does not match the name of the type e.g. output st someType = {}

I imagine the second option is best advised