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xbuild does not parse the following errors, so if there are no other errors it shows a "Compiler crashed" message instead because of the exit code.
MonoDevelop.Core.Assemblies/MsNetFrameworkBackend.cs(63,25): error CS0152: The label `case 4.0:' already occurs in this switch statement
MonoDevelop.Core.Assemblies/MsNetFrameworkBackend.cs(60,25): (Location of the symbol related to previous error)
Tool /Library/Frameworks/Mono.framework/Versions/2.10.9/bin/dmcs execution finished.
/Library/Frameworks/Mono.framework/Versions/2.10.9/lib/mono/4.0/Microsoft.CSharp.targets: error : Compiler crashed with code: 1.
Task "Csc" execution -- FAILED
Done building target "CoreCompile" in project "/Users/michael/Mono/monodevelop/main/src/core/MonoDevelop.Core/MonoDevelop.Core.csproj".-- FAILED
Came across the same thing on Mac OS X 10.9.1, Xamarin version:
Version 4.2.2 (build 2)
Installation UUID: 75bf4db5-2bd9-4a54-8abe-27117258f643
Mono 3.2.6 ((no/9b58377)
GTK+ 2.24.23 theme: Raleigh
Package version: 302060000
*** This bug has been marked as a duplicate of bug 14767 ***