push和pop编译指示

push/pop 编译指示与option指令非常相似，但用于暂时覆盖设置。 示例：

{.push checks: off.}
# 编译本节而不进行运行时检查，因为它对速度至关重要
# ... some code ...
{.pop.} # 恢复堆栈

push/pop can switch on/off some standard library pragmas, example:

{.push inline.}
proc thisIsInlined(): int = 42
func willBeInlined(): float = 42.0
{.pop.}
proc notInlined(): int = 9
 
{.push discardable, boundChecks: off, compileTime, noSideEffect, experimental.}
template example(): string = "https://nim-lang.org"
{.pop.}
 
{.push deprecated, hint[LineTooLong]: off, used, stackTrace: off.}
proc sample(): bool = true
{.pop.}

For third party pragmas it depends on its implementation, but uses the same syntax.