Detailed showerror for SingularException

Author: jishnub

src/exceptions.jl

@@ -28,6 +28,10 @@ struct SingularException <: Exception
     info::BlasInt
 end
 
+function Base.showerror(io::IO, ex::SingularException)
+    print(io, "SingularException: matrix is singular; factorization failed. Zero eigenvalue found at index ", ex.info)
+end
+
 """
     PosDefException
 

test/dense.jl

@@ -1366,4 +1366,9 @@ end
     @test !any(LinearAlgebra.getstructure(A))
 end
 
+@testset "SingularException show" begin
+    A = diagm(0=> [1, 0])
+    @test_throws "matrix is singular; factorization failed" inv(A)
+end
+
 end # module TestDense