Improve RGBASM test coverage

test/asm/character-literals.asm

@@ -32,3 +32,4 @@ char '?', $3f ; ASCII
 char 'F', 0
 char 'ABF', 0
 char '\n\r\t', 0
+assert 0 == '

test/asm/character-literals.err

@@ -12,4 +12,8 @@ warning: character-literals.asm(34) -> character-literals.asm::char(13): [-Wunma
     Unmapped character '\t'
 error: character-literals.asm(34) -> character-literals.asm::char(13):
     Character literals must be a single charmap unit
-Assembly aborted with 3 errors!
+error: character-literals.asm(35):
+    Unterminated character
+error: character-literals.asm(35):
+    Character literals must be a single charmap unit
+Assembly aborted with 5 errors!

test/asm/include-slash.asm

@@ -0,0 +1 @@
+println x

test/asm/include-slash.err

@@ -0,0 +1,3 @@
+error: include-slash.asm(0):
+    Error reading pre-included file 'include-slash-nonexist.inc': No such file or directory
+Assembly aborted with 1 error!

test/asm/include-slash.flags

@@ -0,0 +1 @@
+-Weverything -P include-slash.inc -I include -P include-slash-nonexist.inc

test/asm/include-slash.out

@@ -0,0 +1 @@
+$2A

test/asm/include/include-slash.inc

@@ -0,0 +1 @@
+def x = 42

test/asm/state-file/a.asm

@@ -12,7 +12,7 @@ def variable += 1
 
 def con2 equ -1
 def var2 = variable**2
-def str2 equs strcat("{string}", "\0\n\t\r")
+def str2 equs strcat("{string}", "\0\n\t\r\\\"\{")
 charmap "c2", 10, -11, 987654321
 
 PURGE polo

test/asm/state-file/a.dump.asm

@@ -10,7 +10,7 @@ def var2 = $9
 
 ; String constants
 def string equs "goodbye~"
-def str2 equs "hello!\0\n\t\r"
+def str2 equs "hello!\0\n\t\r\\\"\{"
 
 ; Character maps
 newcharmap main

test/asm/update-refs.sh

@@ -1,10 +0,0 @@
-#!/usr/bin/env bash
-fname=$(mktemp)
-
-for i in *.asm; do
-	../../rgbasm $i >$fname 2>&1
-	mv -f $fname ${i%.asm}.out
-done
-
-rm -f $fname
-exit 0