forked from lix-project/lix
61 lines
1.3 KiB
Plaintext
61 lines
1.3 KiB
Plaintext
|
nix-repl> 1 + 1
|
|||
|
|
2
|
|||
|
|
|
|||
|
|
nix-repl> :doc builtins.head
|
|||
|
|
Synopsis: builtins.head list
|
|||
|
|
|
|||
|
|
Return the first element of a list; abort evaluation if
|
|||
|
|
the argument isn’t a list or is an empty list. You can
|
|||
|
|
test whether a list is empty by comparing it with [].
|
|||
|
|
|
|||
|
|
nix-repl> f = a: "" + a
|
|||
|
|
|
|||
|
|
Expect the trace to not contain any traceback:
|
|||
|
|
|
|||
|
|
nix-repl> f 2
|
|||
|
|
error:
|
|||
|
|
… while evaluating a path segment
|
|||
|
|
at «string»:1:10:
|
|||
|
|
1| a: "" + a
|
|||
|
|
| ^
|
|||
|
|
|
|||
|
|
error: cannot coerce an integer to a string: 2
|
|||
|
|
|
|||
|
|
nix-repl> :te
|
|||
|
|
showing error traces
|
|||
|
|
|
|||
|
|
Expect the trace to have traceback:
|
|||
|
|
|
|||
|
|
nix-repl> f 2
|
|||
|
|
error:
|
|||
|
|
… from call site
|
|||
|
|
at «string»:1:1:
|
|||
|
|
1| f 2
|
|||
|
|
| ^
|
|||
|
|
|
|||
|
|
… while calling anonymous lambda
|
|||
|
|
at «string»:1:2:
|
|||
|
|
1| a: "" + a
|
|||
|
|
| ^
|
|||
|
|
|
|||
|
|
… while evaluating a path segment
|
|||
|
|
at «string»:1:10:
|
|||
|
|
1| a: "" + a
|
|||
|
|
| ^
|
|||
|
|
|
|||
|
|
error: cannot coerce an integer to a string: 2
|
|||
|
|
|
|||
|
|
Turning it off should also work:
|
|||
|
|
|
|||
|
|
nix-repl> :te
|
|||
|
|
not showing error traces
|
|||
|
|
|
|||
|
|
nix-repl> f 2
|
|||
|
|
error:
|
|||
|
|
… while evaluating a path segment
|
|||
|
|
at «string»:1:10:
|
|||
|
|
1| a: "" + a
|
|||
|
|
| ^
|
|||
|
|
|
|||
|
|
error: cannot coerce an integer to a string: 2
|