[llvm-bugs] [Bug 27788] New: DeclRefExprs in lambda captures are not matched by ASTMatchers

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27788

            Bug ID: 27788
           Summary: DeclRefExprs in lambda captures are not matched by
                    ASTMatchers
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: libclang
          Assignee: unassignedclangbugs at nondot.org
          Reporter: flx at google.com
                CC: klimek at google.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

Sample code:

```c++
void foo(int i) {
  [i](){}();
}
````

clang_query$ match declRefExpr(to(varDecl(hasName("i"))))

returns 0 matches.

The generated AST contains a DeclRefExpr to the parameter "i":

`-FunctionDecl 0x7f4243f37980 </tmp/test.cc:1:1, line:3:1> line:1:6 foo 'void
(int)'
  |-ParmVarDecl 0x7f4243f378c0 <col:10, col:14> col:14 used i 'int'
  `-CompoundStmt 0x7f4243f38000 <col:17, line:3:1>
    `-CXXOperatorCallExpr 0x7f4243f37f80 <line:2:3, col:11> 'void'
      |-ImplicitCastExpr 0x7f4243f37f68 <col:10, col:11> 'void (*)(void) const'
<FunctionToPointerDecay>
      | `-DeclRefExpr 0x7f4243f37f18 <col:10, col:11> 'void (void) const'
lvalue CXXMethod 0x7f4243f37bf0 'operator()' 'void (void) const'
      `-ImplicitCastExpr 0x7f4243f37fe8 <col:3, col:9> 'const class (lambda at
/tmp/test.cc:2:3)' <NoOp>
        `-LambdaExpr 0x7f4243f37d90 <col:3, col:9> 'class (lambda at
/tmp/test.cc:2:3)'
          |-CXXRecordDecl 0x7f4243f37ac0 <col:3> col:3 implicit class
definition
          | |-FieldDecl 0x7f4243f37cb8 <col:4> col:4 implicit 'int'
          | |-CXXMethodDecl 0x7f4243f37bf0 <col:7, col:9> col:3 used operator()
'void (void) const' inline
          | | `-CompoundStmt 0x7f4243f37d00 <col:8, col:9>
          | `-CXXDestructorDecl 0x7f4243f37df8 <col:3> col:3 implicit
referenced ~ 'void (void)' inline noexcept-unevaluated 0x7f4243f37df8
          |-ImplicitCastExpr 0x7f4243f37d78 <col:4> 'int' <LValueToRValue>
          | `-DeclRefExpr 0x7f4243f37d50 <col:4> 'int' lvalue ParmVar
0x7f4243f378c0 'i' 'int'
          `-CompoundStmt 0x7f4243f37d00 <col:8, col:9>

Should the DeclRefExpr above be matched or do lambda captures need to be
treated specially?

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