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|
discard """
output: "ok"
cmd: "nim $target --overflowChecks:off $options $file"
"""
# Tests nim's ability to detect overflows
{.push overflowChecks: on.}
var
a = high(int)
b = -2
overflowDetected = false
try:
writeLine(stdout, b - a)
except OverflowDefect:
overflowDetected = true
{.pop.} # overflow check
doAssert(overflowDetected)
block: # Overflow checks in a proc
var
a = high(int)
b = -2
overflowDetected = false
{.push overflowChecks: on.}
proc foo() =
let c = b - a
{.pop.}
try:
foo()
except OverflowDefect:
overflowDetected = true
doAssert(overflowDetected)
block: # Overflow checks in a forward declared proc
var
a = high(int)
b = -2
overflowDetected = false
proc foo()
{.push overflowChecks: on.}
proc foo() =
let c = b - a
{.pop.}
try:
foo()
except OverflowDefect:
overflowDetected = true
doAssert(overflowDetected)
block: # Overflow checks doesn't affect fwd declaration
var
a = high(int)
b = -2
overflowDetected = false
{.push overflowChecks: on.}
proc foo()
{.pop.}
proc foo() =
let c = b - a
try:
foo()
except OverflowDefect:
overflowDetected = true
doAssert(not overflowDetected)
echo "ok"
|