[All] Don't hide original error when failing to scan an assembly for plugin

Related to #3511

Author: Maxime Mangel

src/Fable.Cli/CHANGELOG.md

@@ -15,6 +15,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 * [Python] Remove `$` sign when reporting an error from `assert_equal` and `assert_not_equal` (#3878) (by @joprice)
+* [All] Don't hide original error when failing to scan an assembly for plugin (#3896) (by @MangelMaxime)
 
 ### Fixed
 

src/Fable.Compiler/CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+### Changed
+
+* [All] Don't hide original error when failing to scan an assembly for plugin (#3896) (by @MangelMaxime)
+
 ## 4.0.0-alpha-012 - 2024-06-17
 
 ### Fixed

src/Fable.Transforms/State.fs

@@ -38,12 +38,12 @@ type Assemblies(getPlugin, fsharpAssemblies: FSharpAssembly list, addLog: Severi
                             |> Seq.exists (fun attr ->
                                 attr.AttributeType.TryFullName = Some "Fable.ScanForPluginsAttribute"
                             )
-                        with _ ->
+                        with error ->
                             // To help identify problem, log information about the exception
                             // but keep the process going to mimic previous Fable behavior
                             // and because these exception seems harmless
                             let errorMessage =
-                                $"Could not scan {path} for Fable plugins, skipping this assembly"
+                                $"Could not scan {path} for Fable plugins, skipping this assembly. Original error: {error.Message}"
 
                             addLog Severity.Info errorMessage