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Diffstat (limited to 'tests/mir-opt/basic_assignment.rs')
-rw-r--r-- | tests/mir-opt/basic_assignment.rs | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/tests/mir-opt/basic_assignment.rs b/tests/mir-opt/basic_assignment.rs new file mode 100644 index 000000000..ac350271e --- /dev/null +++ b/tests/mir-opt/basic_assignment.rs @@ -0,0 +1,24 @@ +// this tests move up progration, which is not yet implemented + +// EMIT_MIR basic_assignment.main.SimplifyCfg-initial.after.mir + +// Check codegen for assignments (`a = b`) where the left-hand-side is +// not yet initialized. Assignments tend to be absent in simple code, +// so subtle breakage in them can leave a quite hard-to-find trail of +// destruction. + +fn main() { + let nodrop_x = false; + let nodrop_y; + + // Since boolean does not require drop, this can be a simple + // assignment: + nodrop_y = nodrop_x; + + let drop_x: Option<Box<u32>> = None; + let drop_y; + + // Since the type of `drop_y` has drop, we generate a `replace` + // terminator: + drop_y = drop_x; +} |