--- a/tests/hghave.py Fri Feb 28 14:34:37 2020 +0100
+++ b/tests/hghave.py Tue Feb 18 18:32:31 2020 +0100
@@ -332,6 +332,17 @@
return gethgversion() >= (int(major), int(minor))
+@check("rust", "Using the Rust extensions")
+def has_rust():
+ """Check is the mercurial currently running is using some rust code"""
+ cmd = b'hg debuginstall --quiet 2>&1'
+ match = br'checking module policy \(([^)]+)\)'
+ policy = matchoutput(cmd, match)
+ if not policy:
+ return False
+ return b'rust' in policy.group(1)
+
+
@check("hg08", "Mercurial >= 0.8")
def has_hg08():
if checks["hg09"][0]():