Add more test cases for IF, REPT, and MACRO (#748)

test/asm/code-after-endm-endr-endc.asm

@@ -0,0 +1,27 @@
+println "start"
+
+; will not define 'mac'
+mac: MACRO
+	println \1
+ENDM println "<_<"
+	mac "argument"
+
+; will not repeat
+REPT 3
+	println "hey!"
+ENDR println "<_<"
+
+IF 0
+	println "skipped"
+	bad syntax!?
+ELSE println "<_<"
+	println "else clause"
+ENDC println "<_<"
+
+IF 1
+	println "if clause"
+ELSE println "<_<"
+	println "not skipped"
+ENDC println "<_<"
+
+println "done"

test/asm/code-after-endm-endr-endc.err

@@ -0,0 +1,15 @@
+ERROR: code-after-endm-endr-endc.asm(6):
+    syntax error, unexpected PRINTLN, expecting newline
+ERROR: code-after-endm-endr-endc.asm(7):
+    Macro "mac" not defined
+ERROR: code-after-endm-endr-endc.asm(12):
+    syntax error, unexpected PRINTLN, expecting newline
+ERROR: code-after-endm-endr-endc.asm(17):
+    syntax error, unexpected PRINTLN, expecting newline
+ERROR: code-after-endm-endr-endc.asm(19):
+    syntax error, unexpected PRINTLN, expecting end of file or newline
+ERROR: code-after-endm-endr-endc.asm(23):
+    syntax error, unexpected PRINTLN, expecting newline
+ERROR: code-after-endm-endr-endc.asm(25):
+    syntax error, unexpected PRINTLN, expecting end of file or newline
+error: Assembly aborted (7 errors)!

test/asm/code-after-endm-endr-endc.out

@@ -0,0 +1,5 @@
+start
+else clause
+if clause
+not skipped
+done

test/asm/multiple-else.asm

@@ -0,0 +1,18 @@
+if 0
+	println "zero"
+else
+	println "one"
+	if 1
+		println "A"
+	else
+		println "B"
+	else
+		println "C"
+	else
+		println "D"
+	endc
+else
+	println "two"
+else
+	println "three"
+endc

test/asm/multiple-else.out

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