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Merge pull request #604 from NieDzejkob/narg-overwrite

Don't overwrite symbol when it's not allowed

--- a/src/asm/symbol.c

+++ b/src/asm/symbol.c

@@ -409,6 +409,7 @@

 		      symName, sym->type == SYM_LABEL ? "label" : "constant");

 		dumpFilename(sym);

 		putc('\n', stderr);

+		return sym;

 	} else {

 		/* TODO: can the scope be incorrect when taking over refs? */

 		updateSymbolFilename(sym);

--- /dev/null

+++ b/test/asm/narg-overwrite.asm

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

+_NARG = 0

+_NARG = 0

--- /dev/null

+++ b/test/asm/narg-overwrite.err

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

+ERROR: narg-overwrite.asm(1):

+    '_NARG' already defined as constant at <builtin>

+ERROR: narg-overwrite.asm(2):

+    '_NARG' already defined as constant at <builtin>

+error: Assembly aborted (2 errors)!