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## std.debug: Useful functions for debugging.
## This module is imported by default.
## The `assert` macro checks that a provided assertation is true,
## and panics and dumps information if it is not.
## Asserts remain in release builds. If not desired, see `dbg_assert`
pub macro assert(cond: bool) =
quote
if not `cond` then
panic "assertation failed!\n {}".fmt(dbg(`cond`))
## The `dbg_assert` function provides an assert that is compiled out in release builds.
## This is useful for debugging performance-critical code.
pub macro dbg_assert(cond: bool) =
quote
when debug then # fixme: where is this constant coming from?
assert `cond`
## The `discard` function consumes an object of any type.
## Useful for throwing away the result of a computation.
pub func discard[T](self: T) =
return
## The `panic` function prints a message to `stderr` and quits.
pub func panic(message: str): never =
stderr.write(message, "\n")
std.os.exit(1)
## The special ... syntax is used to mark unimplemented parts of code.
## Such code will compile, but panic upon being called at runtime.
## It is usable almost anywhere, including in type declarations, thanks to compiler magic.
@[magic]
pub func ...: never =
panic("unimplemented")
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