fixup! Add test showcasing failure when removing then adding back type parameters (#957)

Author: aviatesk

test/runtests.jl

@@ -2671,7 +2671,7 @@ const issue639report = []
             @eval using StructParamFullCircle
             sleep(mtimedelay)
             foo1 = StructParamFullCircle.Foo(1)
-            @test StructParamFullCircle.bar(foo1) == "parametric with Int64"
+            @test StructParamFullCircle.bar(foo1) == "parametric with $Int"
 
             # Change Foo to be non-parametric
             write(fn4, raw"""
@@ -2680,12 +2680,12 @@ const issue639report = []
                 struct Foo
                     x::Int
                 end
-                bar(::Foo{T}) where {T} = "parametric with $T"
+                bar(::Foo) = "non parametric"
                 end
                 """)
             @yry()
             foo2 = @invokelatest(StructParamFullCircle.Foo(1))
-            @test @invokelatest(StructParamFullCircle.bar(foo2)) == "nonparam"
+            @test @invokelatest(StructParamFullCircle.bar(foo2)) == "non parametric"
 
             # Now change Foo back to its original parametric definition
             write(fn4, raw"""
@@ -2699,7 +2699,7 @@ const issue639report = []
                 """)
             @yry()
             foo3 = @invokelatest(StructParamFullCircle.Foo(1))
-            @test @invokelatest(StructParamFullCircle.bar(foo3)) == "parametric with Int64"
+            @test @invokelatest(StructParamFullCircle.bar(foo3)) == "parametric with $Int"
 
             rm_precompile("StructParamFullCircle")