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`LOAD` blocks cannot create a ROM section

Fixes #576

--- a/src/asm/section.c

+++ b/src/asm/section.c

@@ -339,6 +339,9 @@

 	if (currentLoadSection)

 		fatalerror("`LOAD` blocks cannot be nested\n");

+	if (sect_HasData(type))

+		error("`LOAD` blocks cannot create a ROM section\n");

+

 	struct Section *sect = getSection(name, type, org, attribs, false);

 	loadOffset = curOffset;

--- /dev/null

+++ b/test/asm/load-rom.asm

@@ -1,0 +1,5 @@

+SECTION "Hello", ROM0

+	ld a, 1

+LOAD "Wello", ROM0

+	ld a, 2

+ENDL

--- /dev/null

+++ b/test/asm/load-rom.err

@@ -1,0 +1,3 @@

+ERROR: load-rom.asm(3):

+    `LOAD` blocks cannot create a ROM section

+error: Assembly aborted (1 errors)!