error: unexpected `}` after definition
  --> testdata/extend/decl.proto:6:20
   |
 6 |     enum E { Z = 0 }
   |                    ^ expected `;`
   |
  help: consider inserting a `;`
   |
 6 |     enum E { Z = 0; }
   |                   +

warning: missing declaration for extension number `7`
  --> testdata/extend/decl.proto:8:24
   |
 8 |     extensions 1 to 3, 4 to 7 [
   |                        ^^^^^^ required by this range
   |
   = note: this is likely a mistake, but it is not rejected by protoc

error: multi-range `extensions` with extension declarations
  --> testdata/extend/decl.proto:9:9
   |
 8 |     extensions 1 to 3, 4 to 7 [
   |                -------------- multiple ranges declared here
 9 |         declaration = {},
   |         ^^^^^^^^^^^ declaration defined here
   |
   = help: this is rejected by protoc due to a quirk in its internal
           representation of extension ranges

error: extension declaration must specify `number`
  --> testdata/extend/decl.proto:9:23
   |
 9 |         declaration = {},
   |                       ^^

error: expected fully-qualified name in `Declaration.full_name`
  --> testdata/extend/decl.proto:13:24
   |
13 |             full_name: "???",
   |                        ^^^^^

error: relative name in `Declaration.full_name`
  --> testdata/extend/decl.proto:18:24
   |
18 |             full_name: "test.x",
   |                        ^^^^^^^^
  help: add a leading `.`
   |
18 |             full_name: ".test.x",
   |                         +

error: expected fully-qualified name in `Declaration.full_name`
  --> testdata/extend/decl.proto:23:24
   |
23 |             full_name: ".test..x",
   |                        ^^^^^^^^^^

error: expected predeclared type or fully-qualified name in `Declaration.type`
  --> testdata/extend/decl.proto:30:19
   |
30 |             type: "???",
   |                   ^^^^^

error: relative name in `Declaration.type`
  --> testdata/extend/decl.proto:35:19
   |
35 |             type: "test.X",
   |                   ^^^^^^^^
  help: add a leading `.`
   |
35 |             type: ".test.X",
   |                    +

error: expected predeclared type or fully-qualified name in `Declaration.type`
  --> testdata/extend/decl.proto:40:19
   |
40 |             type: ".test..X",
   |                   ^^^^^^^^^^

error: relative name in `Declaration.full_name`
   --> testdata/extend/decl.proto:104:20
    |
104 |         full_name: "test.ok4",
    |                    ^^^^^^^^^^
   help: add a leading `.`
    |
104 |         full_name: ".test.ok4",
    |                     +

error: relative name in `Declaration.type`
   --> testdata/extend/decl.proto:105:15
    |
105 |         type: "test.M", // Check that non-absolute paths work fine.
    |               ^^^^^^^^
   help: add a leading `.`
    |
105 |         type: ".test.M", // Check that non-absolute paths work fine.
    |                +

warning: expected type, got message extension `test.extn1`
   --> testdata/extend/decl.proto:124:15
    |
124 |         type: ".test.extn1",
    |               ^^^^^^^^^^^^^
   ::: testdata/extend/decl.proto:129:20
    |
129 |     repeated int32 extn1 = 10;
    |                    ----- `test.extn1` declared here
    |
    = help: `Declaration.type` must name a (possibly unimported) type

error: mismatched types
   --> testdata/extend/decl.proto:129:5
    |
 47 |         type: "int32",
    |               ------- expected due to this
 ...
129 |     repeated int32 extn1 = 10;
    |     ^^^^^^^^^^^^^^ expected `int32`, found `repeated int32`
    |
    = note: expected: scalar type `int32`
               found: scalar type `repeated int32`

error: unexpected message extension name
   --> testdata/extend/decl.proto:130:20
    |
130 |     optional int32 extn2 = 11;
    |                    ^^^^^ expected `.test.wrong`
    |
   ::: testdata/extend/decl.proto:52:20
    |
 52 |         full_name: ".test.wrong",
    |                    ------------- expected name declared here

error: mismatched types
   --> testdata/extend/decl.proto:131:5
    |
 59 |         type: "int32",
    |               ------- expected due to this
 60 |         repeated: true
    |         -------------- `repeated` required here
 ...
130 |     optional int32 extn2 = 11;
131 |     optional int32 extn3 = 12;
    |     ^^^^^^^^^^^^^^ expected `repeated int32`, found `int32`
    |
    = note: expected: scalar type `repeated int32`
               found: scalar type `int32`

error: mismatched types
   --> testdata/extend/decl.proto:132:5
    |
 66 |         type: ".test.M",
    |               --------- expected due to this
 ...
131 |     optional int32 extn3 = 12;
132 |     repeated M extn4 = 13;
    |     ^^^^^^^^^^ expected `test.M`, found `repeated test.M`
    |
    = note: expected: message type `test.M`
               found: message type `repeated test.M`

error: mismatched types
   --> testdata/extend/decl.proto:133:5
    |
 72 |         type: ".test.M",
    |               --------- expected due to this
 73 |         repeated: true
    |         -------------- `repeated` required here
 ...
132 |     repeated M extn4 = 13;
133 |     optional M extn5 = 14;
    |     ^^^^^^^^^^ expected `repeated test.M`, found `test.M`
    |
    = note: expected: message type `repeated test.M`
               found: message type `test.M`

error: use of reserved extension number
   --> testdata/extend/decl.proto:134:24
    |
134 |     optional M extn6 = 15;
    |                        ^^
   ::: testdata/extend/decl.proto:76:34
    |
 76 |       extensions 15 [declaration = {
    |  _________________________________-
 ...  /
 79 | |         type: ".test.M",
 80 | |         reserved: true
    | |                   ---- ... and reserved here
 81 | |     }];
    | \_____- extension declared here

error: mismatched types
   --> testdata/extend/decl.proto:145:5
    |
112 |         type: ".test.M.E",
    |               ----------- expected due to this
 ...
145 |     optional int32 enum1 = 30;
    |     ^^^^^^^^^^^^^^ expected `test.M.E`, found `int32`
    |
    = note: expected: enum type `test.M.E`
               found: scalar type `int32`

error: mismatched types
   --> testdata/extend/decl.proto:146:5
    |
118 |         type: ".test.Idk",
    |               ----------- expected due to this
 ...
145 |     optional int32 enum1 = 30;
146 |     optional int32 enum2 = 31;
    |     ^^^^^^^^^^^^^^ expected unknown type `test.Idk`, found `int32`
    |
    = note: expected: unknown type `test.Idk`
               found: scalar type `int32`

error: mismatched types
   --> testdata/extend/decl.proto:147:5
    |
124 |         type: ".test.extn1",
    |               ------------- expected due to this
 ...
146 |     optional int32 enum2 = 31;
147 |     optional int32 enum3 = 32;
    |     ^^^^^^^^^^^^^^ expected `test.extn1`, found `int32`
    |
    = note: expected: message extension `test.extn1`
               found: scalar type `int32`
    = note: `test.extn1` is not a type; this indicates a bug in the extension
            declaration

encountered 20 errors and 2 warnings