Add a debug-mode MIR pre-codegen test for ?-on-Option

Author: scottmcm

tests/mir-opt/pre-codegen/option_bubble_debug.option_direct.PreCodegen.after.panic-abort.mir

@@ -0,0 +1,37 @@
+// MIR for `option_direct` after PreCodegen
+
+fn option_direct(_1: Option<u32>) -> Option<u32> {
+    debug x => _1;
+    let mut _0: std::option::Option<u32>;
+    let mut _2: isize;
+    let _3: u32;
+    let mut _4: u32;
+    scope 1 {
+        debug x => _3;
+    }
+
+    bb0: {
+        _2 = discriminant(_1);
+        switchInt(move _2) -> [0: bb1, 1: bb2, otherwise: bb4];
+    }
+
+    bb1: {
+        _0 = Option::<u32>::None;
+        goto -> bb3;
+    }
+
+    bb2: {
+        _3 = copy ((_1 as Some).0: u32);
+        _4 = Not(copy _3);
+        _0 = Option::<u32>::Some(move _4);
+        goto -> bb3;
+    }
+
+    bb3: {
+        return;
+    }
+
+    bb4: {
+        unreachable;
+    }
+}

tests/mir-opt/pre-codegen/option_bubble_debug.option_direct.PreCodegen.after.panic-unwind.mir

@@ -0,0 +1,37 @@
+// MIR for `option_direct` after PreCodegen
+
+fn option_direct(_1: Option<u32>) -> Option<u32> {
+    debug x => _1;
+    let mut _0: std::option::Option<u32>;
+    let mut _2: isize;
+    let _3: u32;
+    let mut _4: u32;
+    scope 1 {
+        debug x => _3;
+    }
+
+    bb0: {
+        _2 = discriminant(_1);
+        switchInt(move _2) -> [0: bb1, 1: bb2, otherwise: bb4];
+    }
+
+    bb1: {
+        _0 = Option::<u32>::None;
+        goto -> bb3;
+    }
+
+    bb2: {
+        _3 = copy ((_1 as Some).0: u32);
+        _4 = Not(copy _3);
+        _0 = Option::<u32>::Some(move _4);
+        goto -> bb3;
+    }
+
+    bb3: {
+        return;
+    }
+
+    bb4: {
+        unreachable;
+    }
+}

tests/mir-opt/pre-codegen/option_bubble_debug.option_traits.PreCodegen.after.panic-abort.mir

@@ -0,0 +1,47 @@
+// MIR for `option_traits` after PreCodegen
+
+fn option_traits(_1: Option<u32>) -> Option<u32> {
+    debug x => _1;
+    let mut _0: std::option::Option<u32>;
+    let mut _2: std::ops::ControlFlow<std::option::Option<std::convert::Infallible>, u32>;
+    let mut _3: isize;
+    let _4: u32;
+    let mut _5: u32;
+    scope 1 {
+        debug residual => const Option::<Infallible>::None;
+        scope 2 {
+        }
+    }
+    scope 3 {
+        debug val => _4;
+        scope 4 {
+        }
+    }
+
+    bb0: {
+        _2 = <Option<u32> as Try>::branch(copy _1) -> [return: bb1, unwind unreachable];
+    }
+
+    bb1: {
+        _3 = discriminant(_2);
+        switchInt(move _3) -> [0: bb2, 1: bb3, otherwise: bb5];
+    }
+
+    bb2: {
+        _4 = copy ((_2 as Continue).0: u32);
+        _5 = Not(copy _4);
+        _0 = <Option<u32> as Try>::from_output(move _5) -> [return: bb4, unwind unreachable];
+    }
+
+    bb3: {
+        _0 = <Option<u32> as FromResidual<Option<Infallible>>>::from_residual(const Option::<Infallible>::None) -> [return: bb4, unwind unreachable];
+    }
+
+    bb4: {
+        return;
+    }
+
+    bb5: {
+        unreachable;
+    }
+}

tests/mir-opt/pre-codegen/option_bubble_debug.option_traits.PreCodegen.after.panic-unwind.mir

@@ -0,0 +1,47 @@
+// MIR for `option_traits` after PreCodegen
+
+fn option_traits(_1: Option<u32>) -> Option<u32> {
+    debug x => _1;
+    let mut _0: std::option::Option<u32>;
+    let mut _2: std::ops::ControlFlow<std::option::Option<std::convert::Infallible>, u32>;
+    let mut _3: isize;
+    let _4: u32;
+    let mut _5: u32;
+    scope 1 {
+        debug residual => const Option::<Infallible>::None;
+        scope 2 {
+        }
+    }
+    scope 3 {
+        debug val => _4;
+        scope 4 {
+        }
+    }
+
+    bb0: {
+        _2 = <Option<u32> as Try>::branch(copy _1) -> [return: bb1, unwind continue];
+    }
+
+    bb1: {
+        _3 = discriminant(_2);
+        switchInt(move _3) -> [0: bb2, 1: bb3, otherwise: bb5];
+    }
+
+    bb2: {
+        _4 = copy ((_2 as Continue).0: u32);
+        _5 = Not(copy _4);
+        _0 = <Option<u32> as Try>::from_output(move _5) -> [return: bb4, unwind continue];
+    }
+
+    bb3: {
+        _0 = <Option<u32> as FromResidual<Option<Infallible>>>::from_residual(const Option::<Infallible>::None) -> [return: bb4, unwind continue];
+    }
+
+    bb4: {
+        return;
+    }
+
+    bb5: {
+        unreachable;
+    }
+}

tests/mir-opt/pre-codegen/option_bubble_debug.rs

@@ -0,0 +1,29 @@
+//@ compile-flags: -Copt-level=0 -Zmir-opt-level=1 -Cdebuginfo=limited
+//@ edition: 2024
+// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
+
+#![crate_type = "lib"]
+#![feature(try_blocks)]
+
+// EMIT_MIR option_bubble_debug.option_direct.PreCodegen.after.mir
+pub fn option_direct(x: Option<u32>) -> Option<u32> {
+    // CHECK-LABEL: fn option_direct(_1: Option<u32>) -> Option<u32>
+    // CHECK: = discriminant(_1);
+    // CHECK: [[TEMP:_.+]] = Not({{.+}});
+    // CHECK: _0 = Option::<u32>::Some(move [[TEMP]]);
+
+    match x {
+        Some(x) => Some(!x),
+        None => None,
+    }
+}
+
+// EMIT_MIR option_bubble_debug.option_traits.PreCodegen.after.mir
+pub fn option_traits(x: Option<u32>) -> Option<u32> {
+    // CHECK-LABEL: fn option_traits(_1: Option<u32>) -> Option<u32>
+    // CHECK: = <Option<u32> as Try>::branch(copy _1)
+    // CHECK: [[TEMP:_.+]] = Not({{.+}});
+    // CHECK: _0 = <Option<u32> as Try>::from_output(move [[TEMP]])
+
+    try { !(x?) }
+}