fix missing destruction when discarding complex expression #1682

Job	Run time
Provide additional context for the workflow	1s
Build release binaries (Linux)	7m 25s
Build release binaries (macOS)	6m 23s
Build release binaries (macOS (M1))	2m 50s
Build release binaries (Windows)	11m 55s
Build source archive	2m 49s
Build and test tooling (Linux)	3m 2s
Build and test tooling (macOS)	3m 30s
Build and test tooling (macOS (M1))	2m 8s
Test the compiler and stdlib (Linux, batch #0)	5m 47s
Build docs and release artifacts (Linux)	7m 20s
Build and test tooling (Windows)	3m 26s
Test the compiler and stdlib (Linux, batch #1)	5m 20s
Build docs and release artifacts (macOS)	7m 8s
Test the compiler and stdlib (macOS, batch #0)	6m 34s
Build docs and release artifacts (macOS (M1))	4m 19s
Test the compiler and stdlib (macOS, batch #1)	5m 23s
Build docs and release artifacts (Windows)	12m 14s
Test the compiler and stdlib (macOS (M1), batch #0)	3m 31s
Test the compiler and stdlib (macOS (M1), batch #1)	3m 10s
Test the compiler and stdlib (Windows, batch #0)	10m 1s
Test the compiler and stdlib (Windows, batch #1)	10m 5s
Build release artifacts from source archive (Linux)	10m 22s
Build release artifacts from source archive (macOS)	13m 39s
Build release artifacts from source archive (macOS (M1))	5m 26s
Build release artifacts from source archive (Windows)	18m 18s
Test release artifacts	27s
All check passed	1s
	2h 52m 34s

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