Run ambiguity test inside a clean process; fixes 28804

JuliaLang · Aug 22, 2018 · f31e28a · f31e28a · nanosoldier · Aug 23, 2018
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diff --git a/stdlib/LinearAlgebra/test/ambiguous_exec.jl b/stdlib/LinearAlgebra/test/ambiguous_exec.jl
@@ -0,0 +1,4 @@
+# This file is a part of Julia. License is MIT: https://julialang.org/license
+
+using Test, LinearAlgebra
+@test detect_ambiguities(LinearAlgebra; imported=true, recursive=true) == []
diff --git a/stdlib/LinearAlgebra/test/matmul.jl b/stdlib/LinearAlgebra/test/matmul.jl
@@ -446,7 +446,11 @@ end
 end
 
 @testset "method ambiguity" begin
-    @test detect_ambiguities(LinearAlgebra, Base; imported=true, recursive=true) == []
+    # Ambiguity test is run inside a clean process.
+    # https://github.com/JuliaLang/julia/issues/28804
+    script = joinpath(@__DIR__, "ambiguous_exec.jl")
+    cmd = `$(Base.julia_cmd()) --startup-file=no $script`
+    @test success(pipeline(cmd; stdout=stdout, stderr=stderr))
 end
 
 end # module TestMatmul