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-rw-r--r--tests/incremental/mir-opt.rs11
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diff --git a/tests/incremental/mir-opt.rs b/tests/incremental/mir-opt.rs
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+// MIR optimizations can create expansions after the TyCtxt has been created.
+// This test verifies that those expansions can be decoded correctly.
+
+// revisions:rpass1 rpass2
+// compile-flags: -Z query-dep-graph -Z mir-opt-level=3
+
+fn main() {
+ if std::env::var("a").is_ok() {
+ println!("b");
+ }
+}