Fix Go bindings and enable in CI

- Fix all compilation errors in Go bindings
- Add missing type definitions (Pattern, ASTVector, ParamDescrs)
- Fix boolean comparisons to use bool() casts
- Fix Z3_app type casts using unsafe.Pointer
- Fix null symbol handling to use nil
- Fix unused variable in basic_example.go
- Fix CMake test target to run from examples/go directory
- Restore CI steps to build and test Go bindings

Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

examples/go/basic_example.go

@@ -82,7 +82,6 @@ func main() {
 	fmt.Println("\nExample 4: Checking unsatisfiability")
 	solver.Reset()
 	a := ctx.MkIntConst("a")
-	one := ctx.MkInt(1, ctx.MkIntSort())
 	
 	// a > 0 ∧ a < 0 (unsatisfiable)
 	solver.Assert(ctx.MkGt(a, zero))

src/api/go/CMakeLists.txt

@@ -46,7 +46,8 @@ if(Z3_BUILD_GO_BINDINGS)
                 CGO_LDFLAGS=${CGO_LDFLAGS_VALUE}
                 LD_LIBRARY_PATH=${CMAKE_BINARY_DIR}:$ENV{LD_LIBRARY_PATH}
                 PATH=${CMAKE_BINARY_DIR}$<SEMICOLON>$ENV{PATH}
-                ${GO_EXECUTABLE} run ${CMAKE_SOURCE_DIR}/examples/go/basic_example.go
+                ${GO_EXECUTABLE} run basic_example.go
+            WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/examples/go
             COMMENT "Running Go examples"
             DEPENDS libz3
             VERBATIM

src/api/go/fixedpoint.go

@@ -70,7 +70,7 @@ func (f *Fixedpoint) AddRule(rule *Expr, name *Symbol) {
 	if name != nil {
 		namePtr = name.ptr
 	} else {
-		namePtr = 0
+		namePtr = nil
 	}
 	C.Z3_fixedpoint_add_rule(f.ctx.ptr, f.ptr, rule.ptr, namePtr)
 }
@@ -132,7 +132,7 @@ func (f *Fixedpoint) UpdateRule(rule *Expr, name *Symbol) {
 	if name != nil {
 		namePtr = name.ptr
 	} else {
-		namePtr = 0
+		namePtr = nil
 	}
 	C.Z3_fixedpoint_update_rule(f.ctx.ptr, f.ptr, rule.ptr, namePtr)
 }
@@ -253,12 +253,12 @@ func (s *Statistics) GetKey(idx int) string {
 
 // IsUint returns true if the statistical data at the given index is unsigned integer
 func (s *Statistics) IsUint(idx int) bool {
-	return C.Z3_stats_is_uint(s.ctx.ptr, s.ptr, C.uint(idx)) != 0
+	return bool(C.Z3_stats_is_uint(s.ctx.ptr, s.ptr, C.uint(idx))) 
 }
 
 // IsDouble returns true if the statistical data at the given index is double
 func (s *Statistics) IsDouble(idx int) bool {
-	return C.Z3_stats_is_double(s.ctx.ptr, s.ptr, C.uint(idx)) != 0
+	return bool(C.Z3_stats_is_double(s.ctx.ptr, s.ptr, C.uint(idx))) 
 }
 
 // GetUintValue returns the unsigned integer value at the given index

src/api/go/log.go

@@ -28,7 +28,7 @@ func OpenLog(filename string) bool {
 	defer C.free(unsafe.Pointer(cFilename))
 	
 	result := C.Z3_open_log(cFilename)
-	if result != 0 {
+	if bool(result) {
 		isLogOpen = true
 		return true
 	}

src/api/go/solver.go

@@ -7,7 +7,6 @@ package z3
 import "C"
 import (
 	"runtime"
-	"unsafe"
 )
 
 // Status represents the result of a satisfiability check.

src/api/go/z3.go

@@ -119,6 +119,11 @@ ctx *Context
 ptr C.Z3_symbol
 }
 
+// newSymbol creates a new Symbol.
+func newSymbol(ctx *Context, ptr C.Z3_symbol) *Symbol {
+	return &Symbol{ctx: ctx, ptr: ptr}
+}
+
 // MkIntSymbol creates an integer symbol.
 func (c *Context) MkIntSymbol(i int) *Symbol {
 return &Symbol{
@@ -253,6 +258,55 @@ func (e *Expr) GetSort() *Sort {
 return newSort(e.ctx, C.Z3_get_sort(e.ctx.ptr, e.ptr))
 }
 
+// Pattern represents a Z3 pattern for quantifier instantiation.
+type Pattern struct {
+	ctx *Context
+	ptr C.Z3_pattern
+}
+
+// newPattern creates a new Pattern and manages its reference count.
+func newPattern(ctx *Context, ptr C.Z3_pattern) *Pattern {
+	p := &Pattern{ctx: ctx, ptr: ptr}
+	// Patterns are ASTs in the C API
+	C.Z3_inc_ref(ctx.ptr, (C.Z3_ast)(unsafe.Pointer(ptr)))
+	runtime.SetFinalizer(p, func(pat *Pattern) {
+		C.Z3_dec_ref(pat.ctx.ptr, (C.Z3_ast)(unsafe.Pointer(pat.ptr)))
+	})
+	return p
+}
+
+// ASTVector represents a vector of Z3 ASTs.
+type ASTVector struct {
+	ctx *Context
+	ptr C.Z3_ast_vector
+}
+
+// newASTVector creates a new ASTVector and manages its reference count.
+func newASTVector(ctx *Context, ptr C.Z3_ast_vector) *ASTVector {
+	v := &ASTVector{ctx: ctx, ptr: ptr}
+	C.Z3_ast_vector_inc_ref(ctx.ptr, ptr)
+	runtime.SetFinalizer(v, func(vec *ASTVector) {
+		C.Z3_ast_vector_dec_ref(vec.ctx.ptr, vec.ptr)
+	})
+	return v
+}
+
+// ParamDescrs represents parameter descriptions for Z3 objects.
+type ParamDescrs struct {
+	ctx *Context
+	ptr C.Z3_param_descrs
+}
+
+// newParamDescrs creates a new ParamDescrs and manages its reference count.
+func newParamDescrs(ctx *Context, ptr C.Z3_param_descrs) *ParamDescrs {
+	pd := &ParamDescrs{ctx: ctx, ptr: ptr}
+	C.Z3_param_descrs_inc_ref(ctx.ptr, ptr)
+	runtime.SetFinalizer(pd, func(descrs *ParamDescrs) {
+		C.Z3_param_descrs_dec_ref(descrs.ctx.ptr, descrs.ptr)
+	})
+	return pd
+}
+
 // MkTrue creates the Boolean constant true.
 func (c *Context) MkTrue() *Expr {
 return newExpr(c, C.Z3_mk_true(c.ptr))
@@ -434,28 +488,30 @@ return newExpr(c, C.Z3_mk_app(c.ptr, decl.ptr, C.uint(len(args)), argsPtr))
 
 // MkForall creates a universal quantifier.
 func (c *Context) MkForall(bound []*Expr, body *Expr) *Expr {
-cBound := make([]C.Z3_ast, len(bound))
-for i, b := range bound {
-cBound[i] = b.ptr
-}
-var boundPtr *C.Z3_ast
-if len(bound) > 0 {
-boundPtr = &cBound[0]
-}
-return newExpr(c, C.Z3_mk_forall_const(c.ptr, 0, C.uint(len(bound)), boundPtr, 0, nil, body.ptr))
+	cBound := make([]C.Z3_app, len(bound))
+	for i, b := range bound {
+		// Z3_app is a subtype of Z3_ast; constants are apps
+		cBound[i] = (C.Z3_app)(unsafe.Pointer(b.ptr))
+	}
+	var boundPtr *C.Z3_app
+	if len(bound) > 0 {
+		boundPtr = &cBound[0]
+	}
+	return newExpr(c, C.Z3_mk_forall_const(c.ptr, 0, C.uint(len(bound)), boundPtr, 0, nil, body.ptr))
 }
 
 // MkExists creates an existential quantifier.
 func (c *Context) MkExists(bound []*Expr, body *Expr) *Expr {
-cBound := make([]C.Z3_ast, len(bound))
-for i, b := range bound {
-cBound[i] = b.ptr
-}
-var boundPtr *C.Z3_ast
-if len(bound) > 0 {
-boundPtr = &cBound[0]
-}
-return newExpr(c, C.Z3_mk_exists_const(c.ptr, 0, C.uint(len(bound)), boundPtr, 0, nil, body.ptr))
+	cBound := make([]C.Z3_app, len(bound))
+	for i, b := range bound {
+		// Z3_app is a subtype of Z3_ast; constants are apps
+		cBound[i] = (C.Z3_app)(unsafe.Pointer(b.ptr))
+	}
+	var boundPtr *C.Z3_app
+	if len(bound) > 0 {
+		boundPtr = &cBound[0]
+	}
+	return newExpr(c, C.Z3_mk_exists_const(c.ptr, 0, C.uint(len(bound)), boundPtr, 0, nil, body.ptr))
 }
 
 // Simplify simplifies an expression.
@@ -491,12 +547,12 @@ return newExpr(q.ctx, q.ptr)
 
 // IsUniversal returns true if this is a universal quantifier (forall)
 func (q *Quantifier) IsUniversal() bool {
-return C.Z3_is_quantifier_forall(q.ctx.ptr, q.ptr) != 0
+return bool(C.Z3_is_quantifier_forall(q.ctx.ptr, q.ptr)) 
 }
 
 // IsExistential returns true if this is an existential quantifier (exists)
 func (q *Quantifier) IsExistential() bool {
-return C.Z3_is_quantifier_exists(q.ctx.ptr, q.ptr) != 0
+return bool(C.Z3_is_quantifier_exists(q.ctx.ptr, q.ptr)) 
 }
 
 // GetWeight returns the weight of the quantifier
@@ -523,7 +579,7 @@ return int(C.Z3_get_quantifier_num_no_patterns(q.ctx.ptr, q.ptr))
 // GetNoPattern returns the no-pattern at the given index
 func (q *Quantifier) GetNoPattern(idx int) *Pattern {
 ptr := C.Z3_get_quantifier_no_pattern_ast(q.ctx.ptr, q.ptr, C.uint(idx))
-return newPattern(q.ctx, ptr)
+return newPattern(q.ctx, (C.Z3_pattern)(unsafe.Pointer(ptr)))
 }
 
 // GetNumBound returns the number of bound variables
@@ -556,11 +612,11 @@ return q.AsExpr().String()
 
 // MkQuantifier creates a quantifier with patterns
 func (c *Context) MkQuantifier(isForall bool, weight int, sorts []*Sort, names []*Symbol, body *Expr, patterns []*Pattern) *Quantifier {
-var forallInt C.int
+var forallInt C.bool
 if isForall {
-forallInt = 1
+forallInt = true
 } else {
-forallInt = 0
+forallInt = false
 }
 
 numBound := len(sorts)
@@ -604,11 +660,11 @@ return newQuantifier(c, ptr)
 
 // MkQuantifierConst creates a quantifier using constant bound variables
 func (c *Context) MkQuantifierConst(isForall bool, weight int, bound []*Expr, body *Expr, patterns []*Pattern) *Quantifier {
-var forallInt C.int
+var forallInt C.bool
 if isForall {
-forallInt = 1
+forallInt = true
 } else {
-forallInt = 0
+forallInt = false
 }
 
 numBound := len(bound)
@@ -617,7 +673,7 @@ var boundPtr *C.Z3_app
 if numBound > 0 {
 cBound = make([]C.Z3_app, numBound)
 for i := 0; i < numBound; i++ {
-cBound[i] = C.Z3_app(bound[i].ptr)
+cBound[i] = (C.Z3_app)(unsafe.Pointer(bound[i].ptr))
 }
 boundPtr = &cBound[0]
 }
@@ -723,7 +779,7 @@ var boundPtr *C.Z3_app
 if numBound > 0 {
 cBound = make([]C.Z3_app, numBound)
 for i := 0; i < numBound; i++ {
-cBound[i] = C.Z3_app(bound[i].ptr)
+cBound[i] = (C.Z3_app)(unsafe.Pointer(bound[i].ptr))
 }
 boundPtr = &cBound[0]
 }