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https://github.com/nushell/nushell.git
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4b91ed57dd
# Description
Previously, only direcly-recursive calls were checked for recursion
depth. But most recursive calls in nushell are mutually recursive since
expressions like `for`, `where`, `try` and `do` all execute a separte
block.
```nushell
def f [] {
do { f }
}
```
Calling `f` would crash nushell with a stack overflow.
I think the only general way to prevent such a stack overflow is to
enforce a maximum call stack depth instead of only disallowing directly
recursive calls.
This commit also moves that logic into `eval_call()` instead of
`eval_block()` because the recursion limit is tracked in the `Stack`,
but not all blocks are evaluated in a new stack. Incrementing the
recursion depth of the caller's stack would permanently increment that
for all future calls.
Fixes #11667
# User-Facing Changes
Any function call can now fail with `recursion_limit_reached` instead of
just directly recursive calls. Mutually-recursive calls no longer crash
nushell.
# After Submitting
<!-- If your PR had any user-facing changes, update [the
documentation](https://github.com/nushell/nushell.github.io) after the
PR is merged, if necessary. This will help us keep the docs up to date.
-->
96 lines
2.4 KiB
Rust
96 lines
2.4 KiB
Rust
use nu_test_support::nu;
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#[test]
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fn try_succeed() {
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let output = nu!("try { 345 } catch { echo 'hello' }");
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assert!(output.out.contains("345"));
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}
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#[test]
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fn try_catch() {
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let output = nu!("try { foobarbaz } catch { echo 'hello' }");
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assert!(output.out.contains("hello"));
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}
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#[test]
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fn catch_can_access_error() {
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let output = nu!("try { foobarbaz } catch { |err| $err | get raw }");
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assert!(output.err.contains("External command failed"));
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}
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#[test]
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fn catch_can_access_error_as_dollar_in() {
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let output = nu!("try { foobarbaz } catch { $in | get raw }");
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assert!(output.err.contains("External command failed"));
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}
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#[test]
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fn external_failed_should_be_caught() {
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let output = nu!("try { nu --testbin fail; echo 'success' } catch { echo 'fail' }");
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assert!(output.out.contains("fail"));
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}
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#[test]
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fn loop_try_break_should_be_successful() {
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let output =
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nu!("loop { try { print 'successful'; break } catch { print 'failed'; continue } }");
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assert_eq!(output.out, "successful");
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}
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#[test]
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fn loop_catch_break_should_show_failed() {
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let output = nu!("loop {
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try { invalid 1;
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continue; } catch { print 'failed'; break }
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}
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");
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assert_eq!(output.out, "failed");
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}
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#[test]
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fn loop_try_ignores_continue() {
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let output = nu!("mut total = 0;
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for i in 0..10 {
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try { if ($i mod 2) == 0 {
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continue;}
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$total += 1
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} catch { echo 'failed'; break }
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}
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echo $total
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");
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assert_eq!(output.out, "5");
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}
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#[test]
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fn loop_try_break_on_command_should_show_successful() {
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let output = nu!("loop { try { ls; break } catch { echo 'failed';continue }}");
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assert!(!output.out.contains("failed"));
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}
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#[test]
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fn catch_block_can_use_error_object() {
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let output = nu!("try {1 / 0} catch {|err| print ($err | get msg)}");
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assert_eq!(output.out, "Division by zero.")
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}
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// This test is disabled on Windows because they cause a stack overflow in CI (but not locally!).
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// For reasons we don't understand, the Windows CI runners are prone to stack overflow.
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// TODO: investigate so we can enable on Windows
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#[cfg(not(target_os = "windows"))]
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#[test]
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fn can_catch_infinite_recursion() {
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let actual = nu!(r#"
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def bang [] { try { bang } catch { "Caught infinite recursion" } }; bang
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"#);
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assert_eq!(actual.out, "Caught infinite recursion");
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}
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