Add make tests for preserving test binaries

fix: rust-lang#88110

Author: Patrick Conrad

src/test/run-make/doctests-keep-binaries/Makefile

@@ -0,0 +1,21 @@
+include ../../run-make-fulldeps/tools.mk
+
+# Check that valid binaries are persisted by running them, regardless of whether the --run or --no-run option is used.
+
+all: run no_run
+
+run:
+	mkdir -p $(TMPDIR)/doctests
+	$(RUSTC) --crate-type rlib t.rs
+	$(RUSTDOC) -Zunstable-options --test --persist-doctests $(TMPDIR)/doctests --extern t=$(TMPDIR)/libt.rlib t.rs
+	$(TMPDIR)/doctests/t_rs_2_0/rust_out
+	$(TMPDIR)/doctests/t_rs_8_0/rust_out
+	rm -rf $(TMPDIR)/doctests
+
+no_run:
+	mkdir -p $(TMPDIR)/doctests
+	$(RUSTC) --crate-type rlib t.rs
+	$(RUSTDOC) -Zunstable-options --test --persist-doctests $(TMPDIR)/doctests --extern t=$(TMPDIR)/libt.rlib t.rs --no-run
+	$(TMPDIR)/doctests/t_rs_2_0/rust_out
+	$(TMPDIR)/doctests/t_rs_8_0/rust_out
+	rm -rf $(TMPDIR)/doctests

src/test/run-make/doctests-keep-binaries/t.rs

@@ -0,0 +1,11 @@
+/// Fungle the foople.
+/// ```
+/// t::foople();
+/// ```
+pub fn foople() {}
+
+/// Flomble the florp
+/// ```
+/// t::florp();
+/// ```
+pub fn florp() {}