[llvm-bugs] [Bug 42914] New: [AST] AutoType within AutoTypeLoc is missing deduced type.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42914

            Bug ID: 42914
           Summary: [AST] AutoType within AutoTypeLoc is missing deduced
                    type.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: sammccall at google.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

the program `auto x = 4;` has an AST that looks like:

VarDecl type=T1
 - typeloc type=T2
 - integerliteral

T1 is correctly an auto type that wraps int.
However T2 is undeduced: it's ASTContext::getAutoDeductType().

This irregularity makes it harder/slower to write tools that (e.g.) care what
an `auto` under the cursor expands to.

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