zig

commit a483e38df62f73dc0cdadee6faf3e083094210d4 (tree)
parent ac14b52e85f857f7f70846d22ea18ea265acb91a
Author: Timon Kruiper <timonkruiper@gmail.com>
Date:   Wed,  7 Apr 2021 13:27:36 +0200

stage2: fix bug where invalid ZIR was generated

The following code caused an assertion to be hit:
```
pub fn main() void {
    var e: anyerror!c_int = error.Foo;
    const i = e catch 69;
    assert(69 - i == 0);
}
```

Diffstat:
M
src/Module.zig
 | 
5
+++--

1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/Module.zig b/src/Module.zig
@@ -2863,8 +2863,9 @@ fn astgenAndSemaFn(
 
         _ = try AstGen.expr(&gen_scope, params_scope, .none, body_node);
 
-        if (gen_scope.instructions.items.len == 0 or
-            !astgen.instructions.items(.tag)[gen_scope.instructions.items.len - 1]
+        const inst_tags = astgen.instructions.items(.tag);
+        if (inst_tags.len == 0 or
+            !inst_tags[inst_tags.len - 1]
             .isNoReturn())
         {
             // astgen uses result location semantics to coerce return operands.