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Format INT32_MIN as '-2147483648', not '--2147483648'

--- a/src/asm/format.c

+++ b/src/asm/format.c

@@ -182,10 +182,9 @@

 	if (fmt->type == 'd' || fmt->type == 'f') {

 		int32_t v = value;

-		if (v < 0) {

+		if (v < 0 && v != INT32_MIN) {

 			sign = '-';

-			if (v != INT32_MIN)

-				value = -v;

+			value = -v;

 		}

 	}

--- /dev/null

+++ b/test/asm/minimum-int.asm

@@ -1,0 +1,8 @@

+m = $8000_0000

+assert m == 1 << 31

+assert m == -(1 << 31)

+assert m == (-2)**31

+

+	println "{m}"

+	println "({12d:m})"

+	println "({-12d:m})"

--- /dev/null

+++ b/test/asm/minimum-int.out

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

+$80000000

+( -2147483648)

+(-2147483648 )