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  > (set -e; echo hi); echo $?

It works in my shell. :-/ It looks like you forgot to insert `false` command.

You are pointing to the problem with -e not working in subshell/deep functions, because of POSIX. Right? It's described in bash documentation: http://www.gnu.org/software/bash/manual/html_node/The-Set-Bu...

> I think just defining a die() function and using it after any command that must succeed is more verbose, but less error prone:

Yep. It's the style I developed 12 years ago, when working at Bazaarvoice, when I was lead of devops team. I created the whole library for bash, to use this pattern consistently. See https://github.com/vlisivka/bash-modules#error-handling

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An error occurred on ./test:18 Frame 1 (./test:21) 18 false 19 } 20 21 >>> a Frame 2 (./test:6) 3 source TRAPERR.zsh 4 5 a() { 6 >>> b 7 } 8 9 b() { Frame 3 (./test:10) 7 } 8 9 b() { 10 >>> c 11 } 12 13 c() { Frame 4 (./test:14) 11 } 12 13 c() { 14 >>> d 15 } 16 17 d() { Frame 5 (./test:18) 15 } 16 17 d() { 18 >>> false 19 } 20 21 a