d: Change in DotTemplateExp type semantics leading to regression (PR101619)

By giving dot templates a type, meant that properry resolving silently
started passing for code that should never have passed.  The simple fix
is to provide implementations for checkType and checkValue that give an
error about dot templates having neither a value nor type.

Reviewed-on: https://github.com/dlang/dmd/pull/12920

	PR d/101619

gcc/d/ChangeLog:

	* dmd/MERGE: Merge upstream dmd 1d8386a63.

13 files changed, 63 insertions, 9 deletions

diff --git a/gcc/d/dmd/MERGE b/gcc/d/dmd/MERGE
index d20785d..127f9f8 100644
--- a/gcc/d/dmd/MERGE
+++ b/gcc/d/dmd/MERGE
@@ -1,4 +1,4 @@
-7a3808254878df8cb70a055bea58afc79187b778
+1d8386a63d412c9e77728b0b965025ac4dd40b75
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.
diff --git a/gcc/d/dmd/expression.c b/gcc/d/dmd/expression.c
index 153819a..7166f97 100644
--- a/gcc/d/dmd/expression.c
+++ b/gcc/d/dmd/expression.c
@@ -4200,6 +4200,18 @@ DotTemplateExp::DotTemplateExp(Loc loc, Expression *e, TemplateDeclaration *td)
     this->td = td;
 }
 
+bool DotTemplateExp::checkType()
+{
+    error("%s %s has no type", td->kind(), toChars());
+    return true;
+}
+
+bool DotTemplateExp::checkValue()
+{
+    error("%s %s has no value", td->kind(), toChars());
+    return true;
+}
+
 /************************************************************/
 
 DotVarExp::DotVarExp(Loc loc, Expression *e, Declaration *var, bool hasOverloads)
diff --git a/gcc/d/dmd/expression.h b/gcc/d/dmd/expression.h
index 2ed8fac..9413ad9 100644
--- a/gcc/d/dmd/expression.h
+++ b/gcc/d/dmd/expression.h
@@ -930,6 +930,8 @@ public:
     TemplateDeclaration *td;
 
     DotTemplateExp(Loc loc, Expression *e, TemplateDeclaration *td);
+    bool checkType();
+    bool checkValue();
     void accept(Visitor *v) { v->visit(this); }
 };
 
diff --git a/gcc/testsuite/gdc.test/compilable/test22133.d b/gcc/testsuite/gdc.test/compilable/test22133.d
new file mode 100644
index 0000000..aff762c
--- /dev/null
+++ b/gcc/testsuite/gdc.test/compilable/test22133.d
@@ -0,0 +1,16 @@
+// https://issues.dlang.org/show_bug.cgi?id=22133
+
+struct Slice
+{
+    bool empty() const;
+    int front() const;
+    void popFront()() // note: requires a mutable Slice
+    {}
+}
+
+enum isInputRange1(R) = is(typeof((R r) => r.popFront));
+enum isInputRange2(R) = __traits(compiles, (R r) => r.popFront);
+static assert(isInputRange1!(      Slice) == true);
+static assert(isInputRange1!(const Slice) == false);
+static assert(isInputRange2!(      Slice) == true);
+static assert(isInputRange2!(const Slice) == false);
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail22133.d b/gcc/testsuite/gdc.test/fail_compilation/fail22133.d
new file mode 100644
index 0000000..338d96d
--- /dev/null
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail22133.d
@@ -0,0 +1,24 @@
+// https://issues.dlang.org/show_bug.cgi?id=22133
+/*
+TEST_OUTPUT
+---
+fail_compilation/fail22133.d(16): Error: `s.popFront()()` has no effect
+fail_compilation/fail22133.d(17): Error: template `s.popFront()()` has no type
+---
+*/
+struct Slice
+{
+    void popFront()() {}
+}
+
+auto fail22133(const Slice s)
+{
+    s.popFront;
+    return s.popFront;
+}
+
+auto ok22133(Slice s)
+{
+    s.popFront;
+    return s.popFront;
+}
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424b.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424b.d
index 737958c..c3fc311 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424b.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424b.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424b.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424b.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424b
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424c.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424c.d
index e804d72..220c995 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424c.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424c.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424c.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424c.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424c
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424d.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424d.d
index 5ef9463..669c9ff 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424d.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424d.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424d.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424d.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424d
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424e.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424e.d
index ddf4ded..18bf414 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424e.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424e.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424e.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424e.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424e
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424f.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424f.d
index 751b625..29e0ecc 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424f.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424f.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424f.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424f.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424f
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424g.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424g.d
index d4fa463..b4670de 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424g.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424g.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424g.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424g.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424g
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424h.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424h.d
index 56184a5..b76f5b3 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424h.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424h.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424h.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424h.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424g
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail7424i.d b/gcc/testsuite/gdc.test/fail_compilation/fail7424i.d
index 37042f7..887c859 100644
--- a/gcc/testsuite/gdc.test/fail_compilation/fail7424i.d
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail7424i.d
@@ -1,7 +1,7 @@
 /*
 TEST_OUTPUT:
 ---
-fail_compilation/fail7424i.d(10): Error: expression `this.g()()` is `void` and has no value
+fail_compilation/fail7424i.d(10): Error: template `this.g()()` has no value
 ---
 */
 struct S7424g