[llvm-bugs] [Bug 43933] New: Clang emits invalid fixit for nested designated initializer

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43933

            Bug ID: 43933
           Summary: Clang emits invalid fixit for nested designated
                    initializer
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: bevin.hansson at ericsson.com
                CC: llvm-bugs at lists.llvm.org, neeilans at live.com,
                    richard-llvm at metafoo.co.uk

Godbolt: https://godbolt.org/z/qKE11h

When the following code is compiled with clang -Wall, it emits a fixit for
adding braces for a subobject initializer:

struct {
    signed int x;
    struct {
        signed int y, z;
    } nested;
} i = { .nested.y = 1, 2,
               .x = 3,
                    4 };

<source>:6:16: warning: suggest braces around initialization of subobject
[-Wmissing-braces]

} i = { .nested.y = 1, 2,

               ^~~~~~~~~~

Clang suggests rewriting the code to this:

struct {
    signed int x;
    struct {
        signed int y, z;
    } nested;
} i = { .nested{.y = 1, 2,
               .x = 3,
                    4} };

which is clearly invalid.

Testing on godbolt shows that this bug has existed ever since Clang 3.

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