Remove unused assert toggling

Running testsuite *without* asserts takes roughly 150% or the time to
run it *with* asserts, probably because the compiler is helped by some
of the checks. The toggling is unused anyway, so delete it.

src/debug.jl

@@ -4,9 +4,6 @@
 # Debug info #
 ##############
 
-# Code derived from ToggleableAsserts.jl kept in a separate file
-include("ToggleableAsserts.jl")
-
 abstract type RunicException <: Exception end
 
 struct AssertionError <: RunicException
@@ -23,7 +20,7 @@ function Base.showerror(io::IO, err::AssertionError)
     return
 end
 
-function macroexpand_assert(expr)
+macro assert(expr)
     msg = string(expr)
     return :($(esc(expr)) || throw(AssertionError($msg)))
 end

test/runtests.jl

@@ -22,6 +22,24 @@ using JuliaSyntax:
     end
 end
 
+@testset "Runic.AssertionError" begin
+    issuemsg = "This is unexpected, please file an issue with a reproducible example at " *
+        "https://github.com/fredrikekre/Runic.jl/issues/new."
+    try
+        Runic.@assert 1 == 2
+    catch err
+        @test err isa Runic.AssertionError
+        @test sprint(showerror, err) == "Runic.AssertionError: 1 == 2. " * issuemsg
+    end
+    try
+        Runic.unreachable()
+    catch err
+        @test err isa Runic.AssertionError
+        @test sprint(showerror, err) ==
+            "Runic.AssertionError: unreachable code reached. " * issuemsg
+    end
+end
+
 @testset "Chisels" begin
     # Type stability of verified_kids
     node = Runic.Node(JuliaSyntax.parseall(JuliaSyntax.GreenNode, "a = 1 + b\n"))