fix -typecheck -verify
and experimental features
#68711
Merged
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When using
-enable-experimental-feature
on a non-asserts build, we only emit an error diagnostic that has no source-line information and continue to enable the feature.That doesn't actually prevent use of the experimental feature when you are passing
-typecheck -verify
, since in diagnostics verification mode, a diagnostic with an unknown error location is ignored. Thus, the experimental feature is enabled and run for type-checking, but the compiler would exit with a zero error code.This patch takes a hammer to that escape-hatch, forcing an early non-zero exit the moment an experimental feature is requested. The error message is output to stderr so that CI and other tools should see what happened.