compiler: properly handle jumps to offset 0

When compiling certain expressions as first statement of an ucode
program, e.g. a while loop in raw mode, a jump instruction to offset
zero is emitted which was incorrectly treated as placeholder by the
compiler.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/custom/03_bugs/26_compiler_jmp_to_zero b/tests/custom/03_bugs/26_compiler_jmp_to_zero
new file mode 100644
index 0000000..e7e0127
--- /dev/null
+++ b/tests/custom/03_bugs/26_compiler_jmp_to_zero
@@ -0,0 +1,17 @@
+When compiling certain expressions as first statement of an ucode
+program, e.g. a while loop in raw mode, a jump instruction to offset
+zero is emitted which was incorrectly treated as placeholder by the
+compiler.
+
+-- Testcase --
+while (i++ < 1)
+	print("Test\n");
+-- End --
+
+-- Args --
+-R
+-- End --
+
+-- Expect stdout --
+Test
+-- End --