Detecting errors generated by write-error

try {} catch {} only catches terminating thrown errors, using
invoke-command with the errorvariable captures the error stream

GitPrompt.ps1

@@ -158,13 +158,17 @@ if(!(Test-Path Variable:Global:VcsPromptStatuses)) {
 }
 
 function Global:Write-VcsStatus {
-    $Global:VcsPromptStatuses | foreach { 
+    $Global:VcsPromptStatuses | foreach {
+        $vcsPromptError = $null
         try {
-            $_.Invoke()
+            Invoke-Command -ScriptBlock $_ -ErrorVariable vcsPromptError 2>$null
         }
         catch {
+            $vcsPromptError = $_
+        }
+        if ($null -ne $vcsPromptErrors) {
             # Log the error but dont affect the users prompt, splat the thrown object onto Write-Error so the relevant properties are automatically assigned
-            Write-Error -ErrorAction SilentlyContinue @_
+            Write-Error -ErrorAction SilentlyContinue @vcsPromptError
             $s = $Global:GitPromptSettings
             if ($s) {
                 Write-Prompt $s.BeforeText -BackgroundColor $s.BeforeBackgroundColor -ForegroundColor $s.BeforeForegroundColor