Make `patterns/min_prelude/underscore.carbon` into a min_prelude test (#5469)

The test was placed under a `min_prelude/` path prefix but the
--custom-core and min-prelude include had been omitted.

toolchain/check/testdata/patterns/min_prelude/underscore.carbon

@@ -5,6 +5,9 @@
 // This is mostly checking against crashes for compile time bindings in
 // difficult contexts.
 //
+// INCLUDE-FILE: toolchain/testing/min_prelude/convert.carbon
+// EXTRA-ARGS: --custom-core
+//
 // AUTOUPDATE
 // TIP: To test this file alone, run:
 // TIP:   bazel test //toolchain/testing:file_test --test_arg=--file_tests=toolchain/check/testdata/patterns/min_prelude/underscore.carbon
@@ -130,7 +133,6 @@ fn F() -> {} {
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
 // CHECK:STDOUT:     import Core//prelude
-// CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -221,7 +223,6 @@ fn F() -> {} {
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
 // CHECK:STDOUT:     import Core//prelude
-// CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -292,7 +293,6 @@ fn F() -> {} {
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
 // CHECK:STDOUT:     import Core//prelude
-// CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -359,7 +359,6 @@ fn F() -> {} {
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
 // CHECK:STDOUT:     import Core//prelude
-// CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -416,7 +415,6 @@ fn F() -> {} {
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
 // CHECK:STDOUT:     import Core//prelude
-// CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -492,7 +490,6 @@ fn F() -> {} {
 // CHECK:STDOUT: imports {
 // CHECK:STDOUT:   %Core: <namespace> = namespace file.%Core.import, [concrete] {
 // CHECK:STDOUT:     import Core//prelude
-// CHECK:STDOUT:     import Core//prelude/...
 // CHECK:STDOUT:   }
 // CHECK:STDOUT: }
 // CHECK:STDOUT:
@@ -533,3 +530,178 @@ fn F() -> {} {
 // CHECK:STDOUT:
 // CHECK:STDOUT: fn @F() -> %empty_struct_type;
 // CHECK:STDOUT:
+// CHECK:STDOUT: --- include_files/convert.carbon
+// CHECK:STDOUT:
+// CHECK:STDOUT: constants {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic]
+// CHECK:STDOUT:   %pattern_type.98f: type = pattern_type type [concrete]
+// CHECK:STDOUT:   %As.type.b51: type = generic_interface_type @As [concrete]
+// CHECK:STDOUT:   %As.generic: %As.type.b51 = struct_value () [concrete]
+// CHECK:STDOUT:   %As.type.8ba: type = facet_type <@As, @As(%Dest)> [symbolic]
+// CHECK:STDOUT:   %Self.b4e: %As.type.8ba = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Self.as_type.7f0: type = facet_access_type %Self.b4e [symbolic]
+// CHECK:STDOUT:   %pattern_type.947: type = pattern_type %Self.as_type.7f0 [symbolic]
+// CHECK:STDOUT:   %pattern_type.7dc: type = pattern_type %Dest [symbolic]
+// CHECK:STDOUT:   %Convert.type.ad1: type = fn_type @Convert.1, @As(%Dest) [symbolic]
+// CHECK:STDOUT:   %Convert.0ed: %Convert.type.ad1 = struct_value () [symbolic]
+// CHECK:STDOUT:   %As.assoc_type: type = assoc_entity_type @As, @As(%Dest) [symbolic]
+// CHECK:STDOUT:   %assoc0.1d5: %As.assoc_type = assoc_entity element0, @As.%Convert.decl [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.type.96f: type = generic_interface_type @ImplicitAs [concrete]
+// CHECK:STDOUT:   %ImplicitAs.generic: %ImplicitAs.type.96f = struct_value () [concrete]
+// CHECK:STDOUT:   %ImplicitAs.type.07f: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic]
+// CHECK:STDOUT:   %Self.0f3: %ImplicitAs.type.07f = bind_symbolic_name Self, 1 [symbolic]
+// CHECK:STDOUT:   %Self.as_type.419: type = facet_access_type %Self.0f3 [symbolic]
+// CHECK:STDOUT:   %pattern_type.a93: type = pattern_type %Self.as_type.419 [symbolic]
+// CHECK:STDOUT:   %Convert.type.4cf: type = fn_type @Convert.2, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %Convert.147: %Convert.type.4cf = struct_value () [symbolic]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest) [symbolic]
+// CHECK:STDOUT:   %assoc0.8f8: %ImplicitAs.assoc_type = assoc_entity element0, @ImplicitAs.%Convert.decl [symbolic]
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: file {
+// CHECK:STDOUT:   package: <namespace> = namespace [concrete] {
+// CHECK:STDOUT:     .As = %As.decl
+// CHECK:STDOUT:     .ImplicitAs = %ImplicitAs.decl
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %As.decl: %As.type.b51 = interface_decl @As [concrete = constants.%As.generic] {
+// CHECK:STDOUT:     %Dest.patt: %pattern_type.98f = symbolic_binding_pattern Dest, 0 [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %Dest.loc8_14.1: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc8_14.2 (constants.%Dest)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT:   %ImplicitAs.decl: %ImplicitAs.type.96f = interface_decl @ImplicitAs [concrete = constants.%ImplicitAs.generic] {
+// CHECK:STDOUT:     %Dest.patt: %pattern_type.98f = symbolic_binding_pattern Dest, 0 [concrete]
+// CHECK:STDOUT:   } {
+// CHECK:STDOUT:     %Dest.loc12_22.1: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc12_22.2 (constants.%Dest)]
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @As(%Dest.loc8_14.1: type) {
+// CHECK:STDOUT:   %Dest.loc8_14.2: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc8_14.2 (constants.%Dest)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %As.type: type = facet_type <@As, @As(%Dest.loc8_14.2)> [symbolic = %As.type (constants.%As.type.8ba)]
+// CHECK:STDOUT:   %Self.2: @As.%As.type (%As.type.8ba) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.b4e)]
+// CHECK:STDOUT:   %Convert.type: type = fn_type @Convert.1, @As(%Dest.loc8_14.2) [symbolic = %Convert.type (constants.%Convert.type.ad1)]
+// CHECK:STDOUT:   %Convert: @As.%Convert.type (%Convert.type.ad1) = struct_value () [symbolic = %Convert (constants.%Convert.0ed)]
+// CHECK:STDOUT:   %As.assoc_type: type = assoc_entity_type @As, @As(%Dest.loc8_14.2) [symbolic = %As.assoc_type (constants.%As.assoc_type)]
+// CHECK:STDOUT:   %assoc0.loc9_35.2: @As.%As.assoc_type (%As.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc9_35.2 (constants.%assoc0.1d5)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:     %Self.1: @As.%As.type (%As.type.8ba) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.b4e)]
+// CHECK:STDOUT:     %Convert.decl: @As.%Convert.type (%Convert.type.ad1) = fn_decl @Convert.1 [symbolic = @As.%Convert (constants.%Convert.0ed)] {
+// CHECK:STDOUT:       %self.patt: @Convert.1.%pattern_type.loc9_14 (%pattern_type.947) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @Convert.1.%pattern_type.loc9_14 (%pattern_type.947) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %return.patt: @Convert.1.%pattern_type.loc9_28 (%pattern_type.7dc) = return_slot_pattern [concrete]
+// CHECK:STDOUT:       %return.param_patt: @Convert.1.%pattern_type.loc9_28 (%pattern_type.7dc) = out_param_pattern %return.patt, call_param1 [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %Dest.ref: type = name_ref Dest, @As.%Dest.loc8_14.1 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:       %self.param: @Convert.1.%Self.as_type.loc9_20.1 (%Self.as_type.7f0) = value_param call_param0
+// CHECK:STDOUT:       %.loc9_20.1: type = splice_block %.loc9_20.3 [symbolic = %Self.as_type.loc9_20.1 (constants.%Self.as_type.7f0)] {
+// CHECK:STDOUT:         %.loc9_20.2: @Convert.1.%As.type (%As.type.8ba) = specific_constant @As.%Self.1, @As(constants.%Dest) [symbolic = %Self (constants.%Self.b4e)]
+// CHECK:STDOUT:         %Self.ref: @Convert.1.%As.type (%As.type.8ba) = name_ref Self, %.loc9_20.2 [symbolic = %Self (constants.%Self.b4e)]
+// CHECK:STDOUT:         %Self.as_type.loc9_20.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc9_20.1 (constants.%Self.as_type.7f0)]
+// CHECK:STDOUT:         %.loc9_20.3: type = converted %Self.ref, %Self.as_type.loc9_20.2 [symbolic = %Self.as_type.loc9_20.1 (constants.%Self.as_type.7f0)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @Convert.1.%Self.as_type.loc9_20.1 (%Self.as_type.7f0) = bind_name self, %self.param
+// CHECK:STDOUT:       %return.param: ref @Convert.1.%Dest (%Dest) = out_param call_param1
+// CHECK:STDOUT:       %return: ref @Convert.1.%Dest (%Dest) = return_slot %return.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %assoc0.loc9_35.1: @As.%As.assoc_type (%As.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc9_35.2 (constants.%assoc0.1d5)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = %Self.1
+// CHECK:STDOUT:     .Dest = <poisoned>
+// CHECK:STDOUT:     .Convert = %assoc0.loc9_35.1
+// CHECK:STDOUT:     witness = (%Convert.decl)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic interface @ImplicitAs(%Dest.loc12_22.1: type) {
+// CHECK:STDOUT:   %Dest.loc12_22.2: type = bind_symbolic_name Dest, 0 [symbolic = %Dest.loc12_22.2 (constants.%Dest)]
+// CHECK:STDOUT:
+// CHECK:STDOUT: !definition:
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest.loc12_22.2)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.07f)]
+// CHECK:STDOUT:   %Self.2: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.07f) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.0f3)]
+// CHECK:STDOUT:   %Convert.type: type = fn_type @Convert.2, @ImplicitAs(%Dest.loc12_22.2) [symbolic = %Convert.type (constants.%Convert.type.4cf)]
+// CHECK:STDOUT:   %Convert: @ImplicitAs.%Convert.type (%Convert.type.4cf) = struct_value () [symbolic = %Convert (constants.%Convert.147)]
+// CHECK:STDOUT:   %ImplicitAs.assoc_type: type = assoc_entity_type @ImplicitAs, @ImplicitAs(%Dest.loc12_22.2) [symbolic = %ImplicitAs.assoc_type (constants.%ImplicitAs.assoc_type)]
+// CHECK:STDOUT:   %assoc0.loc14_35.2: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc14_35.2 (constants.%assoc0.8f8)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   interface {
+// CHECK:STDOUT:     %Self.1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.07f) = bind_symbolic_name Self, 1 [symbolic = %Self.2 (constants.%Self.0f3)]
+// CHECK:STDOUT:     %Convert.decl: @ImplicitAs.%Convert.type (%Convert.type.4cf) = fn_decl @Convert.2 [symbolic = @ImplicitAs.%Convert (constants.%Convert.147)] {
+// CHECK:STDOUT:       %self.patt: @Convert.2.%pattern_type.loc14_14 (%pattern_type.a93) = binding_pattern self [concrete]
+// CHECK:STDOUT:       %self.param_patt: @Convert.2.%pattern_type.loc14_14 (%pattern_type.a93) = value_param_pattern %self.patt, call_param0 [concrete]
+// CHECK:STDOUT:       %return.patt: @Convert.2.%pattern_type.loc14_28 (%pattern_type.7dc) = return_slot_pattern [concrete]
+// CHECK:STDOUT:       %return.param_patt: @Convert.2.%pattern_type.loc14_28 (%pattern_type.7dc) = out_param_pattern %return.patt, call_param1 [concrete]
+// CHECK:STDOUT:     } {
+// CHECK:STDOUT:       %Dest.ref: type = name_ref Dest, @ImplicitAs.%Dest.loc12_22.1 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:       %self.param: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419) = value_param call_param0
+// CHECK:STDOUT:       %.loc14_20.1: type = splice_block %.loc14_20.3 [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)] {
+// CHECK:STDOUT:         %.loc14_20.2: @Convert.2.%ImplicitAs.type (%ImplicitAs.type.07f) = specific_constant @ImplicitAs.%Self.1, @ImplicitAs(constants.%Dest) [symbolic = %Self (constants.%Self.0f3)]
+// CHECK:STDOUT:         %Self.ref: @Convert.2.%ImplicitAs.type (%ImplicitAs.type.07f) = name_ref Self, %.loc14_20.2 [symbolic = %Self (constants.%Self.0f3)]
+// CHECK:STDOUT:         %Self.as_type.loc14_20.2: type = facet_access_type %Self.ref [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)]
+// CHECK:STDOUT:         %.loc14_20.3: type = converted %Self.ref, %Self.as_type.loc14_20.2 [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)]
+// CHECK:STDOUT:       }
+// CHECK:STDOUT:       %self: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419) = bind_name self, %self.param
+// CHECK:STDOUT:       %return.param: ref @Convert.2.%Dest (%Dest) = out_param call_param1
+// CHECK:STDOUT:       %return: ref @Convert.2.%Dest (%Dest) = return_slot %return.param
+// CHECK:STDOUT:     }
+// CHECK:STDOUT:     %assoc0.loc14_35.1: @ImplicitAs.%ImplicitAs.assoc_type (%ImplicitAs.assoc_type) = assoc_entity element0, %Convert.decl [symbolic = %assoc0.loc14_35.2 (constants.%assoc0.8f8)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   !members:
+// CHECK:STDOUT:     .Self = %Self.1
+// CHECK:STDOUT:     .Dest = <poisoned>
+// CHECK:STDOUT:     .Convert = %assoc0.loc14_35.1
+// CHECK:STDOUT:     witness = (%Convert.decl)
+// CHECK:STDOUT:   }
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Convert.1(@As.%Dest.loc8_14.1: type, @As.%Self.1: @As.%As.type (%As.type.8ba)) {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %As.type: type = facet_type <@As, @As(%Dest)> [symbolic = %As.type (constants.%As.type.8ba)]
+// CHECK:STDOUT:   %Self: @Convert.1.%As.type (%As.type.8ba) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.b4e)]
+// CHECK:STDOUT:   %Self.as_type.loc9_20.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc9_20.1 (constants.%Self.as_type.7f0)]
+// CHECK:STDOUT:   %pattern_type.loc9_14: type = pattern_type %Self.as_type.loc9_20.1 [symbolic = %pattern_type.loc9_14 (constants.%pattern_type.947)]
+// CHECK:STDOUT:   %pattern_type.loc9_28: type = pattern_type %Dest [symbolic = %pattern_type.loc9_28 (constants.%pattern_type.7dc)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @Convert.1.%Self.as_type.loc9_20.1 (%Self.as_type.7f0)) -> @Convert.1.%Dest (%Dest);
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: generic fn @Convert.2(@ImplicitAs.%Dest.loc12_22.1: type, @ImplicitAs.%Self.1: @ImplicitAs.%ImplicitAs.type (%ImplicitAs.type.07f)) {
+// CHECK:STDOUT:   %Dest: type = bind_symbolic_name Dest, 0 [symbolic = %Dest (constants.%Dest)]
+// CHECK:STDOUT:   %ImplicitAs.type: type = facet_type <@ImplicitAs, @ImplicitAs(%Dest)> [symbolic = %ImplicitAs.type (constants.%ImplicitAs.type.07f)]
+// CHECK:STDOUT:   %Self: @Convert.2.%ImplicitAs.type (%ImplicitAs.type.07f) = bind_symbolic_name Self, 1 [symbolic = %Self (constants.%Self.0f3)]
+// CHECK:STDOUT:   %Self.as_type.loc14_20.1: type = facet_access_type %Self [symbolic = %Self.as_type.loc14_20.1 (constants.%Self.as_type.419)]
+// CHECK:STDOUT:   %pattern_type.loc14_14: type = pattern_type %Self.as_type.loc14_20.1 [symbolic = %pattern_type.loc14_14 (constants.%pattern_type.a93)]
+// CHECK:STDOUT:   %pattern_type.loc14_28: type = pattern_type %Dest [symbolic = %pattern_type.loc14_28 (constants.%pattern_type.7dc)]
+// CHECK:STDOUT:
+// CHECK:STDOUT:   fn(%self.param: @Convert.2.%Self.as_type.loc14_20.1 (%Self.as_type.419)) -> @Convert.2.%Dest (%Dest);
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @As(constants.%Dest) {
+// CHECK:STDOUT:   %Dest.loc8_14.2 => constants.%Dest
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Convert.1(constants.%Dest, constants.%Self.b4e) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %As.type => constants.%As.type.8ba
+// CHECK:STDOUT:   %Self => constants.%Self.b4e
+// CHECK:STDOUT:   %Self.as_type.loc9_20.1 => constants.%Self.as_type.7f0
+// CHECK:STDOUT:   %pattern_type.loc9_14 => constants.%pattern_type.947
+// CHECK:STDOUT:   %pattern_type.loc9_28 => constants.%pattern_type.7dc
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @ImplicitAs(constants.%Dest) {
+// CHECK:STDOUT:   %Dest.loc12_22.2 => constants.%Dest
+// CHECK:STDOUT: }
+// CHECK:STDOUT:
+// CHECK:STDOUT: specific @Convert.2(constants.%Dest, constants.%Self.0f3) {
+// CHECK:STDOUT:   %Dest => constants.%Dest
+// CHECK:STDOUT:   %ImplicitAs.type => constants.%ImplicitAs.type.07f
+// CHECK:STDOUT:   %Self => constants.%Self.0f3
+// CHECK:STDOUT:   %Self.as_type.loc14_20.1 => constants.%Self.as_type.419
+// CHECK:STDOUT:   %pattern_type.loc14_14 => constants.%pattern_type.a93
+// CHECK:STDOUT:   %pattern_type.loc14_28 => constants.%pattern_type.7dc
+// CHECK:STDOUT: }
+// CHECK:STDOUT: