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Test that `OPT r` fails immediately if the recursion depth is already exceeded

Fixes #1034

--- /dev/null

+++ b/test/asm/opt-r-decrease.asm

@@ -1,0 +1,11 @@

+MACRO m

+  DEF depth += 1

+  IF depth == 10

+    OPT r9

+  ENDC

+  println "at depth {d:depth}"

+  m

+ENDM

+

+  DEF depth = 0

+  m

--- /dev/null

+++ b/test/asm/opt-r-decrease.err

@@ -1,0 +1,2 @@

+FATAL: opt-r-decrease.asm(11) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(7) -> opt-r-decrease.asm::m(4):

+    Recursion limit (9) exceeded

--- /dev/null

+++ b/test/asm/opt-r-decrease.out

@@ -1,0 +1,9 @@

+at depth 1

+at depth 2

+at depth 3

+at depth 4

+at depth 5

+at depth 6

+at depth 7

+at depth 8

+at depth 9