big: Squashed shl1 bug when a larger dest was reused for a smaller result.

core/math/big/test.py

@@ -254,7 +254,13 @@ def test_pow(base = 0, power = 0, expected_error = Error.Okay):
 
 def test_sqrt(number = 0, expected_error = Error.Okay):
 	args  = [arg_to_odin(number)]
-	res   = int_sqrt(*args)
+	try:
+		res = int_sqrt(*args)
+	except OSError as e:
+		print("{} while trying to sqrt {}.".format(e, number))
+		if EXIT_ON_FAIL: exit(3)
+		return False
+
 	expected_result = None
 	if expected_error == Error.Okay:
 		if number < 0:
@@ -384,6 +390,7 @@ TESTS = {
 		[ 54321,	12345],
 		[ 55431,		0, Error.Division_by_Zero],
 		[ 12980742146337069150589594264770969721, 4611686018427387904 ],
+		[   831956404029821402159719858789932422, 243087903122332132 ],
 	],
 	test_log: [
 		[ 3192,			1, Error.Invalid_Argument],
@@ -405,6 +412,7 @@ TESTS = {
 		[  42, Error.Okay, ],
 		[  12345678901234567890, Error.Okay, ],
 		[  1298074214633706907132624082305024, Error.Okay, ],
+		[  686885735734829009541949746871140768343076607029752932751182108475420900392874228486622313727012705619148037570309621219533087263900443932890792804879473795673302686046941536636874184361869252299636701671980034458333859202703255467709267777184095435235980845369829397344182319113372092844648570818726316581751114346501124871729572474923695509057166373026411194094493240101036672016770945150422252961487398124677567028263059046193391737576836378376192651849283925197438927999526058932679219572030021792914065825542626400207956134072247020690107136531852625253942429167557531123651471221455967386267137846791963149859804549891438562641323068751514370656287452006867713758971418043865298618635213551059471668293725548570452377976322899027050925842868079489675596835389444833567439058609775325447891875359487104691935576723532407937236505941186660707032433807075470656782452889754501872408562496805517394619388777930253411467941214807849472083814447498068636264021405175653742244368865090604940094889189800007448083930490871954101880815781177612910234741529950538835837693870921008635195545246771593130784786737543736434086434015200264933536294884482218945403958647118802574342840790536176272341586020230110889699633073513016344826709214, Error.Okay, ],
 	],
 	test_root_n: [
 		[  1298074214633706907132624082305024, 2, Error.Okay, ],