Add more tests for edge-case macro and interpolation expansion behavior

Fixes #1803

test/asm/blue-paint-limits.asm

@@ -0,0 +1,43 @@
+macro outer_interp
+  def s equs "macro inner_interp\1\nprintln \"interp: \1 and \\1\"\nendm"
+  {s}
+  purge s
+endm
+; this prints "1 and red" and "2 and blue"...
+outer_interp 1
+inner_interp1 red
+outer_interp 2
+inner_interp2 blue
+
+macro do
+  \#
+endm
+macro outer_mac
+  do macro inner_mac\1\nprintln "mac: \1 and \\1"\nendm
+endm
+; ...but this prints "1 and \1" and "2 and \1"
+outer_mac 1
+inner_mac1 red
+outer_mac 2
+inner_mac2 blue
+
+macro outer_concat
+  do macro inner_concat\1\nprintln "concat: \1 and "++\\1\nendm
+endm
+; this does print "1 and red" and "2 and blue" though
+outer_concat 1
+inner_concat1 "red"
+outer_concat 2
+inner_concat2 "blue"
+
+macro simple
+  println "(\1)"
+endm
+; this prints """("\\1")""", not """("\1")"""
+simple "\\1"
+
+macro nth
+  println \1
+endm
+; this does not print "lol", it's an error
+nth \\2, lol

test/asm/blue-paint-limits.err

@@ -0,0 +1,3 @@
+error: Invalid character '2' after line continuation
+    at blue-paint-limits.asm::nth(40) <- blue-paint-limits.asm(43)
+Assembly aborted with 1 error!

test/asm/blue-paint-limits.out

@@ -0,0 +1,8 @@
+interp: 1 and red
+interp: 2 and blue
+mac: 1 and \1
+mac: 2 and \1
+concat: 1 and red
+concat: 2 and blue
+("\\1")
+$2

test/asm/delayed-interpolation.asm

@@ -0,0 +1,32 @@
+DEF SLIME_HP  EQU 35
+DEF SLIME_ATK EQU 15
+DEF SLIME_DEF EQU 26
+DEF MIMIC_HP  EQU 20
+DEF MIMIC_ATK EQU 21
+DEF MIMIC_DEF EQU 28
+
+MACRO with_each
+	for i, 1, _NARG
+		REDEF temp EQUS STRRPL(\<_NARG>, "?", "\<i>")
+		{temp}
+	endr
+ENDM
+
+DEF with_each_stat EQUS "with_each HP, ATK, DEF,"
+
+with_each_stat """
+	println STRFMT("Average ? is %d", (SLIME_? + MIMIC_?) / 2)
+"""
+
+MACRO buff_monster
+	REDEF monster EQUS STRUPR(STRSLICE("\1", 0, 1)) ++ STRLWR(STRSLICE("\1", 1))
+	; delayed \{interpolation\} is necessary here
+	; escaping the '}' is not essential (same as '>' in HTML)
+	with_each_stat """
+		DEF buffed = \1_? * 120 / 100
+		println "{monster}'s ? went from \{d:\1_?\} to \{d:buffed}!"
+	"""
+ENDM
+
+buff_monster MIMIC
+buff_monster SLIME

test/asm/delayed-interpolation.out

@@ -0,0 +1,9 @@
+Average HP is 27
+Average ATK is 18
+Average DEF is 27
+Mimic's HP went from 20 to 24!
+Mimic's ATK went from 21 to 25!
+Mimic's DEF went from 28 to 33!
+Slime's HP went from 35 to 42!
+Slime's ATK went from 15 to 18!
+Slime's DEF went from 26 to 31!