Patching local function does not work in a string interpolation

[ollien]

👋

In my testing, it looks like patching does not work if a method is called from within a string interpolation expression. I took a look at the "limitations" section of the docs, and didn't see this mentioned, so I think it's a bug.

Module:

defmodule Patchtest do
 def greet() do
 "Hello, world!"
 end

 def format_greeting_1() do
 greeting = greet()
 "The program says: #{greeting}"
 end

 def format_greeting_2() do
 "The program says: #{greet()}"
 end
end

Test:

defmodule PatchtestTest do
 use ExUnit.Case
 use Patch
 doctest Patchtest

 test "greets the world" do
 patch(Patchtest, :greet, "Hello, patched!")

 assert Patchtest.format_greeting_1() == "The program says: Hello, patched!"
 assert Patchtest.format_greeting_2() == "The program says: Hello, patched!"
 end
end

This fails with:

 1) test greets the world (PatchtestTest)
 test/patchtest_test.exs:6
 Assertion with == failed
 code: assert Patchtest.format_greeting_2() == "The program says: Hello, patched!"
 left: "The program says: Hello, world!"
 right: "The program says: Hello, patched!"
 stacktrace:
 test/patchtest_test.exs:10: (test)

[ollien]

After some investigation, it seems this only affects local calls, not all calls